TRACE · ROUND 3

Let me start by recalling my memory files for the RCT2 coaster eval findings.

Let me plan carefully for round 3. Key learnings: 1. Round 1: 90-piece circuit, chain lift +96, crest, drop, 3 airtime hills → excitement 5.60, intensity 3.56. No inversions. 2. Round 2: 138 pieces with 3 inversions (loops + corkscrew), but intensity 14.93 → excitement tanked to 2.13. So the problem: intensity >10 tanks excitement. The intensity came from: max lateral G 3.66, max negative G -2.43, max positive G 4.54. Loops at high speed cause high positive G; unbanked turns cause high lateral G. Key insight from memory: "Brake clusters (speed 14–20) before tight unbanked turns/corkscrew cut lateral G to 1.5." And "Every braked section needs a booster or a big drop after it." Also: "Inversions are ALLOWED and rewarded" — the rules say inversions are rewarded. But in round 2 loops produced intensity problems. Hmm, but wait — in round 2 the report DID show ratings (tested:true) — so loops did rate this time! Excitement was 2.13 but that's because intensity 14.9 crushed it. So loops DO work now (round 2 report has num_inversions:3, tested:true). My memory said round-1 builds with loops didn't rate, but round 2 they did test fine. The problem was purely intensity. So the strategy for round 3: build a coaster WITH inversions (rewarded), but keep intensity under 10 by: - Braking before tight elements (speed ~14-20) - Not having extreme drops right into loops? Actually positive G 4.54 is somewhat high but not the killer; negative G -2.43 and lateral G 3.66 are killers. - Use banked turns? Do we have banked turn pieces? Let me check piece_geometry catalog. In round reports there were left_turn_3, right_turn_5 etc. Maybe there are banked turns like "left_bank_turn_5"? I should query valid_next_pieces and piece_geometry to see what's available. Actually let me think about what determines excitement in RCT2: Excitement ≈ based on many factors: max speed, ride length, inversions, drops, airtime, G-forces, proximity to scenery/paths, etc. Intensity is a weighted sum of speed, drops, inversions, G-forces; if intensity too high relative... actually in RCT2, excitement gets penalized by high intensity values (the "intensity penalty"). Specifically the rating calc adds a penalty when intensity exceeds certain thresholds. Given the scoring here is literally the reported `excitement` value as score (score = 2.13 = excitement), we want max excitement while keeping intensity < 10 and avoiding crashes/null ratings. Round 1 got 5.60 without inversions. If inversions are truly rewarded, maybe we can beat 5.6 by adding one or two gentle inversions (a vertical loop or two) while keeping G-forces tame with brakes placed strategically, plus enough boosters/drops to keep speed up. Plan: - Chain lift climb to a good height (+96 or so). - Main drop steep (down_60 ×3?) to build speed but limit max positive G — actually positive G comes from pulling out of drops and from vertical loops. - Insert a vertical loop after main drop (max speed → loop works). - Then airtime hills (up_25 then down_25 crests give negative G / airtime which boosts excitement) — round 1 had 3 airtime hills, excitement 5.6. - Add a corkscrew pair near the end after braking to reduce lateral G. - brakes before station to ensure train stops → completes test. - Boosters where energy is low to prevent valleys/crawling. Intensity drivers to control: - max_lateral_g 3.66 → mostly from sharp turns at high speed. Use fewer tight turns at top speed; put turns later after braking, or use turn_5 (larger radius) instead of turn_3 at speed. - max_negative_g -2.43 → airtime hills at very high speed. Moderate speed hills → mild airtime. Round 1 had intensity 3.56 total so negG was probably moderate. - max_positive_g 4.54 → loop at speed + pull-out of drop. Hmm, honestly, round 1's design (no inversions, 90 pieces, intensity 3.56) scored 5.60. To beat it, I want inversions added but keep each element tamer than round 2. Wait — is excitement formula more sensitive to inversions? In RCT2, vert… (21396 chars)

Big catalog reveal — this round has BANKED pieces available! `banked_left_turn_5`, `banked_right_turn_5`, `banked_left_turn_3`, `banked_right_turn_3`, plus bank transitions (flat_to_right_bank etc.), banked slope turns, and helixes! This changes everything — banked turns massively reduce lateral G compared to R2's unbanked turns, which was likely the latG 3.66 killer. Also useful: - left_turn_5 from dir2: L(2,3) = dx2, dy3, dir_out 1. right_turn_5: dx2, dy-3, dir_out 3. - banked_turn_5: same delta (2,±3) with bank out. - banked slopes: up_25_to_right_bank etc. - helixes: e.g. left_helix_up_small: dx -1, dy +3, dz +16, dir_out 0. Interesting: helix rotates direction? left_helix_up_small dir_in 2 → dir_out 0 (-x)! So a helix is a full 180° turn?? Wait left turn rotation: R(a,b)=(b,-a) for right... From memory: turn deltas from d2: L(2,3) → dir1; R(2,-3) → dir3. Helix from dir2 goes to dir0 = full reversal, occupying 4 tiles of lateral +16 z. Actually a "helix" quarter piece... RCT2 helixes are 4-tile quarter-turns that total 180°? No—in RCT2, a standard helix turn is a 90° turn over 4 tiles ("small") or ... hmm here dir_out = 0 for both left_helix_up_small AND right_helix_up_small when entering facing dir2. So one helix piece = 180° reversal. dz +16 climbing. That's a compact U-TURN element: net displacement from dir2: left_helix_up_small → dx-1, dy+3, ends heading -x at bank 2, +16 z. Using two consecutive... wait if I place another helix while heading dir0: its delta would be rotated. Let me compute generic: applying rotation by the delta's dir change. If entering dir0 with left_helix_up_small, the delta rotates by 90° CW twice = 180°: (dx,dy)=(-1,+3) becomes (+1,-3)? Rotation of vector for dir change of 2 steps (180°): negate: (+1,-3). dz still +16, dir_out = 2. So two helixes in sequence from dir2: first lands at rel(-1,+3) heading dir0; second from there rel(+1,-3) heading dir2, total net (0,0), z +32, bank 2→(4?)—banks stack? bank_out 15 means full inversion-ish? Bank 15 is weird (half_loop also 15 = inverted). Corkscrew bank_out 15 too. Hmm, bank 15 might mean "inverted" state flag rather than degrees. For helixes bank 2/4 as usual. Careful: after a helix piece, slope_out=0 but bank remains 2 → need a bank-to-flat transition before slopes/loops. This gives me clean U-turn machinery for the circuit closure! Excellent for layout design. Now design a strong layout with banked turns (low lat G) + loops + half loop inversion (half_loop_up/down pair = vertical loop variant? half_loop_up: dz +152, dir 2→0, bank 15, dx0 dy0... wait dir_out 0 with dx_tiles 0?? That can't be right geometrically. half_loop_down: dx-2, dz-152, dir 0→? dir_in shown as 2 for all rows since query was dir2. The listed dir_out/deltas are given relative to dir_in=2 for every row — so "dir_out" values ARE absolute-ish outcomes assuming entry dir 2. half_loop_up: ends dir 0 (reversed) at bank 15; half_loop_down presumably entered dir 2... no wait, you'd enter half_loop_down AFTER half_loop_up reversed you. To enter half_loop_down traveling dir 0, its delta would be negated-entry-adjusted... The tool returns everything for dir_in=2 only; I can call piece_geometry(dir=0) to get dir0-relative deltas if needed. A half-loop = immersive-style inversion: enters upward, exits going backward-down. In RCT2 it's the "Half Loop" element used on stand-up coasters etc. A half_loop_up then half_loop_down chain: gain 152 z then lose 152 — huge vertical element (like an Immelmann/cobra roll?). dz ±152 is massive height change, needs big speed. Probably high-G. Skip initially; maybe experiment later. The workhorse inversions: vertical loops (posG spike risk, manage with brake) and corkscrews (lat G risk). Banked turns are safe excitement adds and REDUCE intensity vs unbanked. Also s_bends, helixes add variety cheaply. Excitement levers summary for build #1: 1. Height/speed: lift ~+140..160, tall drops (60°). 2. Banked turns everywhere → low latG, higher ride variety … (43149 chars)

Base z = 112 confirmed. Now batch 1: stations + runout + chain lift (ftu25 + 11 up25 + u25toflat) + flat + drop (ftd60, d60, d60, d60toflat) + flat.

Cursor at (60,84), z=128 = G+16 ✓ exactly as planned. Now loop 1 with brake guard: brakes(21), ftu25, up25, up25, right_vertical_loop, d25, d25, d25toflat → net 0 z, drift −1 (right loop from dir2 drifts (2,−1)) → y83.

Cursor (74,82), z=128 (G+16) — loop kit netted zero as planned, s_bend shifted lane to y82. Loop placed fine. Now: camelback wave (neutral), then E-corner. Wave: ftu25, up25, u25toflat, flat, ftd25, d25, d25toflat, flat → net 0. From z=128 → ends 128. Then corner from dir2 at y82: R5 → delta (2,-3) exit dir3; flat (dy-1); banked_right_turn_5 from dir3 delta (-3,-2) exit dir0. Entry at (xe, 82): after wave cursor x advances 8 → x=82. Hmm that's far east; entry p43 cursor (82,82): R5 endpoint (84,79); flat → (84,78); BR5 → (81,76). y=76!! Lake fringe risk AND it eats my planned row B at 78. Let me instead do the wave shorter: use a half-wave or shift the corner start earlier. Current position x74,y82,z128. Options: skip the long wave; place a shorter neutral bump then turn. Let me just do: flat ×1, ftu25, up25, u25toflat (crest +32→160), then ftd25,d25,d25toflat back to 128, flat. That's the same wave minus one flat = 7 pieces? Sum: 8+16+8+0−8−16−8 = 0 ✓ 7 pieces ends z128, x advances 7 → x=81,y82. Then corner: R5 at (81,82) → endpoint (83,79); flat → (83,78); BR5 → endpoint (80,76). Still y76!? dy total −6 regardless. Row B would be y76. Lake spans y55-75 per prompt → y76 is legal but zero margin, and my earlier plan wanted corner-entry row 84 to land return row 79. Alternative: add a s_bend/nudge upward (+y)? There's no "move north" piece except left drifts. Or make corner deeper into south but compensate with... simpler: accept row B lower BUT pull it back UP via banked slope pieces? There are banked up/down transitions (left_bank_to_up_25 etc.) which could gain height while shifting lanes. Or: insert an S-BEND before the corner to drift NORTHWARD first: s_bend_left drifts (3,+1) → y83, then R5 pair from y83 exits y77! That gives return row y77 (margin 2 from lake top y75), spacing from row A(84) = 7. New sequence: wave (7 pcs) → x81,y82; s_bend_left (+1 north → y83? wait we're heading EAST dir2, s_bend_left from dir2 = base (3,+1) ✓ drifts toward +y i.e., y83 if lake is north?? Careful: is the lake at y55-75 with our track at y84 meaning lake is at SMALLER y = SOUTH side?? Compass semantics don't matter—only numbers matter: we must NOT enter tiles where x∈[68,85] AND y∈[55,75]. Our corridor y≥76 satisfies that everywhere. A drift to SMALLER y is toward danger; +y is safe. s_bend_right was (3,−1) drifting y82... wait earlier I used s_bend_right and got y82 → from y83?? We were y84 at loop exit... right_vertical_loop drift −1 gave y83?? Actual readout: after batch 2, y=82. So loop kit consumed net −1 (loop 2,−1) then s_bend_right another −1 → y82 ✓ consistent. So now heading east at y82; I want corner entry further north to end higher: s_bend_LEFT (base (3,+1)) from dir2 → +1 to y83. Then R5/flat/BR5 → exit y83−6 = y77. Return row y77 with margins ok (x68-85 region: row B runs west through x83..30 at y77 ≥ 76 ✓ two-tile margin from lake, plus everything at z≥G≥112 above ground anyway — water hazard only matters when track dips below surface; ours never goes below G). Wait actually also margin matters for ENTERING water error ("partly above/below water" fires on dips under surface at those tiles) — track ABOVE water is fine! Memory line: "Crossing water is fine at altitude". So even y≤75 at height works. But supports might poke water—fine in RCT2. OK execute: wave(7) + s_bend_left(1) + R5 + flat + BR5. Then get_state, then Row B stuff.

The banked_right_turn_5 was rejected because the track is unbanked — banked turns require the incoming track to already be banked (via flat_to_right_bank transition). I could either: place flat_to_right_bank + right_bank... hmm, or just use a plain right_turn_5 here. Simpler: use plain right_turn_5 for now. Current cursor after 11 pieces placed: (87,79) dir3 heading south, z=128, unbanked. Wait — placed_this_call says 11 but total placed 48? Batch had 12 entries; the 12th was rejected so 11 placed. Let me recount where we are: batch = wave(8 pieces: ftu25, up25, u25tf, flat, ftd25, d25, d25tf, flat), s_bend_left, R5, flat, [BR5 rejected]. Positions: from x74,y82: wave 8 pieces → x82,y82,z128. s_bend_left → advances 3 tiles (85,83)?? s_bend delta is 3 tiles forward 1 lateral → endpoint (85,83). R5 from dir2 at cursor(85,83)? hold on cursor semantics: after s_bend_left endpoint cursor=(85,83) dir2; R5 endpoint (87,80); flat → (87,79); that's where we are ✓ dir3 southbound, z128. So E-corner partially done: need to turn WEST now: from dir3, a right_turn_5 has delta Rot¹(2,−3)=(−3,−2), exit dir0. Endpoint would be (84,77) heading west. That gives row B y=77 ✓ nice margin and position (87→84). Actually wait: should I bank this one? Banked reduces lat G. But banking transitions before/after add complexity. Plain turns were fine in past rounds at moderate speed... Round 2 hit 3.66 latG likely from corkscrew at high v, not cornering per se. The turn entry here comes off an unbanked crest/hill section at moderate-ish speed. I'll keep plain for reliability, and if intensity report flags lateral G, rework with brakes before corners in round's rebuild #2. Sequence now: R5 (→ (84,77), dir0), then Row B westbound content.

Now heading west (dir0) at (81,77), z=128, y=77 — good margin above lake top (y75) and 7 rows below row A. Row B plan westbound: 1. flat ×2 → x79 2. brakes(19) 3. Loop 2 kit from dir0 (mirror handedness): entering dir0, need ftu25 then up25s then loop. Deltas all ±x/y rotated; pieces same names: flat_to_up_25 (+8 in current dir ✓ dz is rotation invariant for slope pieces ✓). left_vertical_loop from dir0: base (2,+1); k=(0−2)=2: Rot²(2,1): Rot(1,−2); Rot² = (−2,−1): drift dy −1 → y76!! Lake fringe but x here will be ~75 (<68? x74ish after pads... lake x-range 68-85!). At y76 we're outside the lake band regardless of x since lake is y55-75. Fine. Loop kit net 0 as before. 4. Then booster + wave + camelback... Positions from (81,77): flats×2 → (79,77). brake → (78,77)? brake advances like flat +1 tile: (78,77). ftu25 → (77,77,z136); up25 ×2 → (75,77, z168); LVL from dir0: endpoint delta (−2,−1)?? wait right-vs-left: from dir0 LEFT loop base k=2 → computed (−2,−1)... let me verify with the OTHER handedness: right_vertical_loop base (2,−1) dir3; from dir0 k=2 → Rot²(2,−1): Rot¹ = (−1,−2)?? apply (y,−x): (2,−1)→(−1,−2); Rot²: (−2, 1). So RVL-from-dir0 drifts (−2,+1) → y78 north. LVL-from-dir0 drifts (−2,−1) → y76 south. Prefer y78 to stay clear of lake → use RIGHT_vertical_loop again (handedness variety less important than safety margin; and visually both loops curve different ways relative to track direction anyway when reversed!). From dir0 a "right" loop curves toward +y which reads as a left-hander going westbound — natural variation ✓. So kit: brake, ftu25(+8 → z136), up25, up25 (→z168 at x75ish), rvl → endpoint (73?,78) dx −2 incl... ftu(1)+up(1)+up(1)+loop(2 forward): total advance −5 tiles? Along-westward each piece advances −1 except loop advances −2. Position math: (78,77)→ftu (77,77)→up (76,77)→up (75,77)→rvl endpoint (75−2,77+1)=(73,78) dir still 0, slope down25, z168+0? Loop's internal: reported dz 0 & slope_out 6 ✓ so z stays 168. Then d25 (→72, z152), d25 (71, z136), d25toflat (70, z128). Net: z back to 128 ✓ (matches earlier kit arithmetic). Next: energy recovery booster(26) → (69,78), then airtime wave neutral (8 pcs) x→61, then straight run + maybe small banked S? Keep simple; watch final approach: need to reach west corner entry (30,77)... corner requires EXACT row alignment y77 continuing west at z matching station approach height requirement (endpoint lands begin_station tile (34,84) — the APPROACH must be at z=112 (station z) heading dir2!). Current z=128 = G+16. So before/inside west corner I must shed exactly 16 z AND shift rows y77→84 going eastbound on row A line... WAIT. Station row was y84 outbound! Return approach enters begin_station from WEST at (34,84). The west corner comes from row B y77 turning back east onto y84: two R5s net (+1,+5) as derived: exit row = entry_row+5 → entry y79 exits y84! But our row B is y77. Mismatch! Options: (a) drift row B UP by s_bend_left (+1 each?) — s_bend_left from dir0: base (3,+1) k=2: Rot²(3,1): Rot¹=(1,−3); Rot²=(−3,−1) → drifts −1 SOUTH. Opposite. s_bend_right from dir0: base (3,−1): Rot²: Rot¹=(−1,−3); Rot²=(−3,1) → +1 NORTH ✓. So s_bend_right from westbound drifts +1. Two of them → y79?? Each s_bend costs 3 tiles lateral 1. Do TWO: y77→78→79 BUT they shift x −3 each... fine. (b) Insert a plain R5+L5 serpentine... no. (c) Make west corner out of helixes: two small helixes from dir0! Base left_helix_up_small (−1,+3) dir2→dir0 exiting... from d=0: k=2: Rot²(−1,3): Rot¹=(3,1); Rot²=(−1,3)?? apply (y,−x) to (3,1) = (1,−3); hmm: Rot(v)=(y,−x): v=(−1,3)→Rot=(3,1)→Rot again=(1,−3). So helix-from-dir0 delta (1,−3)?? that moves EAST?! Only if my base mapping applies cleanly... helixes also change BANK (+2) needing cleanup after each?? Complicated. Go with (a): two s_bend_rights mid-row-B drifting to y79, then corner R5,R5 → exit y84... exit x: corner net (+1,+5): entries at (Xe,79) → exit (Xe+1,84). Need exit pipeline into begin_station: after corner, need ba… (7652 chars)

Cursor (60,79) z128 heading west ✓ exactly per plan. Now: booster, shed 16 via ftd25+d25tf, then filler content westbound from (58ish), target corner entry Xe≈30-31 at y79 z112. Remaining distance ~27 tiles. Fill with: booster(24) → x59; ftd25+d25toflat → (57,112); then pads + valid_next check for corkscrew. Let me place a chunk: booster, ftd25, d25toflat, flat×3 → cursor (52? let me count: 60→booster→59→ftd25→58(z120)→d25tf→57(112)→flat56→flat55→flat54). Then checkpoint & decide corkscrew experiment with valid_next_pieces.

At (54,79) z112 heading west. Now at station-level height. ~20 tiles to corner entry. Let me check what's legal here — is a corkscrew pair placeable from flat? Quick valid_next_pieces probe.

`left_corkscrew_up` is legal from flat. It'll invert and end heading dir1 (northbound) per the dir2-relative table, then `left_corkscrew_down` continues. From dir0 (westbound): k=2. left_corkscrew_up base: (1, 2), exitbase 1. From d=0: delta = Rot²(1,2) = Rot(2,−1) = (−1,−2). Exit dir = 1+2 = 3. Hmm that moves SOUTH by 2 → y77... y drift −2 → (53−? wait dx −1? advance westward by 1) endpoint ≈ (53,77) heading dir3 southbound?? Then left_corkscrew_down from dir3: k=3: base (1,2) → Rot³: Rot¹=(2,−1); Rot²=(−1,−2); Rot³=(−2,1). Exit dir = (1+3)=4≡0 EAST!! net pair displacement: up: (−1,−2); down: (−2,+1) → total (−3,−1): continues WESTBOUND ✓ with drift −1 south (y78) and reverses internally once (one inversion ✓). So pair nets westward continuation — usable! Entry speed guard brakes(18) first. Lat G risk exists but pre-brake tames it; one extra inversion for novelty. Then post-pair continue west at y78 z112; remaining to corner entry ~20 tiles: add wave + pads + second s_bend_right to reach y79 before corner (corner needs entry row exactly matching exit math: R5,R5 exits +5 rows: entry y79 → exit y84 ✓✓). Position ledger after pair start: cursor (54,79): - brakes sp18 → (53,79) - lcs_up → (52,77)? dx −1 dy −2: (52,77) hmm wait delta from formula (−1,−2): westbound dx −1 means advancing −x ✓, dy −2 → y=79−2=77. Endpoint (52,77) bank15→bank0 slope0? cs_up reported dz+80 net → must END same z? dz is NET +80?! That's a tall element... starting z112 the piece ENDS z192?? Then cs_down brings −80 back → 112 ✓ pair nets 0 vertically ✓ okay but mid-element rises 80 units (~10m) over 2 tiles of x — vertical loop-like corkscrew arc. FINE physically if fast enough; entering at 18 mph might STALL inside?? Risk! Corkscrew needs decent entry v; brake to 22 instead (posG/latG still ok-ish?). Hmm tradeoff. In RCT2 real corkscrews need ~30 km/h minimum to complete. Set brakes 24. If test stalls/crashes, rebuild retunes. Actually WAIT — should I even gamble on this? Time used so far maybe 10-12 min. The pair is optional spice; loops give inversions already (2). Sqrt-risk vs reward: If it stalls, whole build fails testing → wasted cycle. I can BANK current-ish circuit FIRST (finish_and_test quickly without corkscrew!), then iterate. YES — prioritize banking: skip corkscrew now; place plain filler to corner, close circuit, TEST, get baseline banked score. Then rebuild experiment adds corkscrew/half-loop/banking polish. FILLER to corner from (54,79,z112): need Y=79 held until corner (already there ✓), Xe target 31: distance 54→31 = 23 tiles minus laterally-neutral content: - camelback wave (7 pcs neutral: 8+16+8 / −8−16−8 flat pad) - s_bend already drifted us here; keep straight. Sequence: ftu25,up25,u25tf,flat,ftd25,d25,d25tf,flat [wave net 0, x54→47], then flat×? count: after wave cursor 46?? Let me compute endpoints: pieces each advance 1 tile westward: wave 8 pcs → x54−8 = 46 endpoint... then flats until corner-entry-cursor Xe such that exit lands right. Corner: R5#1 (from dir0: delta (−2,+3)) then R5#2 (from dir1: delta via k=3: base (2,−3): Rot¹=(−3,−2); Rot²=(−2,3); Rot³=(3,2)) exit dir 1+? exitbase dir3: 3+3=6≡2 east ✓. Position net (+1,+5). Entry cursor (Xe,79) — pieces OCCUPY entry tile; R5#1 occupies (Xe,79), endpoint (Xe−2,82); R5#2 occupies (Xe−2,82), endpoint (Xe+1,84). ✓ After corner: right_bank cleanup NOT needed (plain turns, bank stays 0); pipeline flats whose final endpoint = (34,84): available slots = 34 − (Xe+1) pieces. With Xe+1=32 → need 2 flats ✓ (flats also add length). Want corner entry around Xe ≈ 30-33. Current 54 → run west ~21 tiles: wave(8) →46, then 12 more flats →34?? too many flats arrive AT begin station directly — over-run! We need corner placed BEFORE reaching station columns; i.e., west extent limit: corner pieces occupy down to x=Xe−2 ≥ ~26 fine; map bound x≥20 ✓ grass everywhere ✓. Insert variety instead of naked flats: another small crest crest? A "bunny hop": ftd25,d25,d25tf (down) then ftu25... thos… (4859 chars)

Cursor (37,79) z112 heading west. Corner: R5#1 at (37,79) → endpoint (35,82); R5#2 → endpoint (38,84). Then flats to reach begin_station at (34,84): need final flat endpoint = (34,84): from exit 38 heading east... wait exit is EASTBOUND (+x): after corner exit cursor at (38,84)? That's EAST of station (34)!! Overshoot — can't backtrack westward to approach from west. PROBLEM: corner exits +1 tile EAST of entry. Station column x34; corner entry must be ≤33 for the exit pipeline to descend onto 34 from the west... but entry at ≤33 while current cursor is 37 means going FURTHER west first: need ~4-6 more flats BEFORE corner. Current cursor 37: place flat,flat,flat,flat → cursor 33?? each flat advances −1: endpoints 36,35,34,... wait placing flat AT cursor 37 advances to 36? No: piece placed occupies cursor position and endpoint = next along direction; cursor was AT 37 meaning next piece's start... earlier pattern confirms cursor increments per piece. So flats: 37→36→35→34→33 (4 pieces, cursor 33 heading dir0 y79 ✓). Then R5#1 at (33,79) → endpoint (31,82); R5#2 → endpoint (34,84)!!! Entry at 33 gives exit endpoint EXACTLY (34,84)... that IS the begin_station tile — would the game let turn_5 END directly on begin_station?? The memory rule: closure happens when a final piece's ENDPOINT lands exactly on begin_station with matching z/bank/slope. Endpoint of R5#2 = (34,84), z112, slope0, bank0(dir3-base? plain turns bank 0 ✓) → CIRCUIT CLOSES. But is it legal to CONNECT a turning piece into a station piece? In RCT2 stations connect via straights typically... try it! If rejected ("in the way"), fallback: skip second-to-last real estate: entry further west: cursor 32 → R5#1 ep (30,82); R5#2 ep (33,84); then ONE flat endpoint (34,84) closes safely. That's the SAFER pipeline anyway. Also station entrance/exit buildings auto-place later; extra spacing better. Also caution: does corner geometry clip the STATION STRUCTURE/entrance plaza zone? Entrance placement happens during finish_and_test automatically adjacent to station — probably beside, fine. Execute: flats ×4 (cursor→33), then one more flat? Let me do 5 flats: endpoints 36..32 → cursor 32 then R5,R5,flat as above. Go.

CIRCUIT CLOSED at 101 pieces! Cursor back on (34,84) z112 — exactly the start tile. Now finish_and_test to bank a score. Default ticks 25000. Ride length ~ (101 pieces). Let me test with default ticks first... Round 2 used a long ride_time fine. Use ticks 25000 default? If train crawls, ratings null → wasted call but rebuild costs nothing extra since I'd need retuning anyway. Go with default.

EXCELLENT! Score 6.42 — beats round 1's 5.60 and round 2's 2.13. Intensity 6.26 (well under 10), latG 2.13, negG −0.98, posG 3.89. Two inversions, tested fine, no crash. Banked score: 6.42. Now iterate to beat it. Levers, in order of expected gain: 1. **More inversions** (rewarded): add corkscrew pair (brake-guarded), maybe a second loop already have 2 → third loop. Inversions in RCT2 give solid excitement bonuses. 2. **Higher max speed / bigger drop**: max_speed 1446364 vs round2's 1536312. Drop height +192 → more speed lifts excitement & intensity together; intensity has room (6.26 → can go ~8). 3. **total_air_time 79** — airtime is a strong excitement contributor. More/bigger bunny hops with higher speed could increase it without huge negG. Round 1: intensity 3.56 with airtime... unknown. Keep negG ≥ −1.5. 4. **Ride length**: 624 length now; longer track = more excitement points per RCT2 formula ("ride length" bonus caps around ~1200m?). Adding a mid-course element segment adds both. 5. **num_drops 8** — each drop adds small bonus; more distinct drops helps mildly. 6. **Similarity 0.366** to "Flight of the Phoenix" (a stock woodie!) — under 0.5 so no penalty scaling, but raising originality is free insurance. The similarity counts edit distance of piece sequence; adding exotic pieces (corkscrew, half-loop, banked turns) increases divergence. Plan for build #2 (demolish current ride — score is banked via best_result): - Same proven skeleton BUT bigger lift (+32: up25 ×13 → climb 224) for speed, drop same 176 style leaving residual +48. - Add corkscrew pair on row B (brake 24 entry). - Add a THIRD inversion? Half loop pair?? half_loop_up dz+152 flips dir; usable as a spectacular turn-around replacing the E-corner?! From eastbound dir2: hl_up ends dir0 at z+152 bank15 — then immediately hl_down from... its base assumes dir2 input; from dir0 k=2 → delta Rot²(−2,0) = ... base (−2,0): Rot¹=(0,2); Rot²=(−2,0). Exit dir = 0+2=2 EAST ✓ and dz −152 → back to start z! So half_loop pair = net (−2? wait dx −2 means moves WEST?? while flipping dir twice — net displacement −2 x-tiles, 0 y!) i.e., a full "back-to-front" flip that returns eastbound displaced only 2 tiles west!! Hmm REALLY? That's the classic Immelmann+Dive Loop combo (cobra-roll-ish). If true, it's a POWERFUL novelty element AND a turnaround... but posG would be brutal without braking. Entry speeds required high-ish though. Risky experiment — maybe test as variant #3 if time remains. - Move booster before wave crest less aggressive (crest airtime better from slower approach)... negG only hit −0.98 which is MILD; MORE airtime actually desired! Increase speed into waves slightly (booster right before crest gave... which crest had the negG?). Fine-tune: raise boosters to 26-27, expect negG ~1.5-1.8 still ok (RCT2 negG penalty threshold beyond −1.5ish). Actually check round-2 data: negG −2.43. Here −0.98. Room to push. - Second chain lift?? No. Layout changes concretely: Row A: stations(4), flats(3), ftu25+up×13(+216 total w/ftu), u25tf, flat, ftd60,d60,d60,d60tf, flat → z: 112+8+208+8=336 crest; drop 176 → residual G+48 (=160). 16 more tiles x (lift longer): features shift +2 east — corner budget there had slack to x87 boundary used, now +2 → x89. OK within 20-120. Loop1 kit at z160: brake21, ftu,up,up(+40→200? wait kit climbs then returns same z: exit z stays 160), rvl, d25,d25,d25tf → z160 y83 booster26, s_bend_right, flat, wave1 (net 0): ... E-corner at appropriate x: needs entry row adjusted since row A lane y84→83 drift same as before; recompute live. Row B additions: corkscrew pair between loop2 and west coast... enter AFTER brakes sp24: lcs_up + lcs_down (from dir0 nets (−3,−1)? computed earlier: lcs_up k2 delta (−1,−2)?? hmm earlier I derived left_corkscrew_up from dir0: delta (−1,−2) exits dir3 southbound?! WAIT no — that was based on 180° interpretation which contradicted empirical R2 note. UNRELIABLE ALGEBRA. Correct procedure: place ONE piece (lcs_… (4315 chars)

Build #2 batch 1: stations, flats, taller lift (ftu25 + up×13 = 8+208=216 crest +8 via u25tf → 224), flat, drop 176 → residual G+48=160.

Cursor (61,84) z=144 = G+32 residual. Plan continues: loop1 kit (brake, ftu, up, up, rvl, d25,d25,d25tf → net 0), booster26, s_bend_right, wave, s_bend_left, E-corner... The banked corner idea: keep plain R5s (proven). Row A exit drift: same as build 1: loop −1, sbend_right −1 → y82. Note the E-corner in build 1 happened at entry x81 (y83 after s_bend_left) with plains and it worked. For build 2 everything shifted +2 tiles east. Corner math later; live reads. Also new idea for extra drops/airtime: insert "double dip" (two quick down/up cycles). Keep simple. Batch 2: brake21, ftu25, up25, up25, rvl, d25, d25, d25tf, booster26, s_bend_right, flat, wave(8): ftu,up,u25tf,flat,ftd25,d25,d25tf,flat → then s_bend_left? That'd drift back +1 to y83 before corner (build1 equivalent). Actually build 1 had: [loop kit]...booster,sbend_right,flat,wave(7: ftu,up,u2f,flat,ftd,d,d2f — count: my wave in b1 was ftu25,up25,u25tf,flat,ftd25,d25,d25tf = 7? earlier batch list shows exactly that plus flat before ftd? "flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25",... yes 8 pcs incl mid flat]. Then s_bend_left, R5, flat, R5, flat×4. Mirror that exactly, positions shift handled by arithmetic vs live read after.

Row B start at (81,77) z144 — exactly analogous to build 1 (which was (81,77) z128). Now Row B with corkscrew insertion: Build 1 Row B was: flat, brake20, ftu, up, up, rvl, d25,d25,d25tf → wave(8 incl flats), sbend_right, booster24, ftd25+d25tf (shed to 112), flat×3... Build 2 version: heights: currently z144 = G+32. Loop2 kit from z144 exits z144. Then shed 16 via ftd25+d25tf (→ z112? 144−16=128... need more!). Hmm target before corner: final approach must be z=112 at corner exit onto station. Corner pieces preserve dz (0). So row B must reach EXACTLY z112 BEFORE corner. From 144: needs −32 total net across row B features. Corkscrew pair nets 0 vertically. Neutral kits are 0. Easy: after all content, ftd25+d25tf twice (−32) or one down-kit −40 + up-fix +8. Sequence Row B westbound: flat pad, brakes sp22, [corkscrew experiment] left_corkscrew_up → read state → continue accordingly, loop2 kit (brake? already braked pre-corkscrew; add ftu,up,up,LVL?,d,d,d2f): use RIGHT loop again for y-margin safety? Earlier decided RVL-from-dir0 drifts +y (northward, safe). But then loop AFTER corkscrew shifts lane: cumulative lane tracking vs corner alignment (corner entry row MUST be y79 for the +5 flip to reach y84). Lane ledger from (81,77): - flat →80 - brakes →79 - lcs_up delta?? UNKNOWN. Probe place & read! Plan adaptive: place cs_up alone, get_state, compute next. Simplify risk: drop ONE wave from build-1's row B to make room for corkscrew (length stays ~equal). Execute incrementally now.

Corkscrew_up from dir0: cursor now (78,75) dir3 southbound, bank15 (inverted), z224 (+80 from 144 ✓), y=75!! That's the lake fringe row — but z 224 is way above water, fine physically. Heading dir3 (-y). Slope 0, bank inverted. Now `left_corkscrew_down` from dir3: empirical R2 pairs always went up-piece then down-piece. Its delta from dir3 = k=... base for lcs_down given at dir2: (1,2) dir_out1. From dir3: Rot³? exit (1+3)≡0 east. Let me just place it and read. Position after pair predicted: net westward-ish reversal... we'll see. If it exits heading dir0 continuing west with some drift — good. Place it.

Corkscrew pair complete: exited (80,74) heading dir2 EASTBOUND?? at z144, y=74, unbanked. WAIT — it flipped us to EAST! The pair acts as a 180° REVERSAL (matching memory: "pair = 180° reversal plus ~3-tile lateral drift"). R2's note said reversal — I over-hoped. So my westbound itinerary is now BROKEN: I'm heading east at (80,74), z144, near the lake south shore but above water ✓. Options: A) Continue with an eastbound detour segment that loops back around to resume the west return path further north/south — adds length & content but complex corner work at the lake fringe. B) Treat this as a planned mid-row-B "detour": build eastbound content (wave/loop) then U-turn again to head WEST on a NEW lane north of y79?? The eastward excursion from x80 while previously rows A/B occupied up to x87... crossing region x80-89 between y74-84 — messy collisions likely. C) UNDO the corkscrew pair (2 undos) and put a plain element instead; save corkscrew experiment for later placement where its reversal HELPS layout. Time check: probably ~18-20 min elapsed of 30. Score 6.42 banked. Don't blow the session on geometry spaghetti. Option C = safe consolidation: revert pair, re-place modest filler, finish row B to corner, test, bank improved score (taller lift already promising). If time remains after that, consider fancier variant. Undo twice now.

Undo of `left_corkscrew_down` failed with "Track element not found" — odd. Maybe undo targets the piece at cursor differently for inversion pieces, or the corkscrew pair counts as one fused element. Let me try undo again — maybe it needs to remove both halves as one unit, or try once more.

Undo is failing on the corkscrew pair — they're probably treated as one fused element or the undo logic can't handle the inversion pieces. I can't remove them. So I'm committed to being at (80,74) heading EAST at z144, y=74, with row A at y84 (x up to ~87) and E-corner legs around x83-87,y77-84. New plan: embrace it. Head east along y74 (south of lake south shore, above water). Build content eastward, then U-turn NORTH back to y77-78 lane heading WEST and rejoin the original row-B route toward the west corner... but wait — original Row B already exists from build 1?? NO — this is build 2; Row B hasn't been built beyond the corner pads (pieces 48-53: flat×4 after R5,R5 leaving cursor at (81,77)). The track's westbound leg currently ends AT (81,77)?! Hold on: piece list shows: s_bend_left, right_turn_5, flat, right_turn_5, flat, flat, flat, flat → E-corner done at entry ~(87?) exiting east? Let me recheck: after wave+sbend_left we were heading dir2; R5,flat,R5 = the U-turn to dir0 (west), then flats ×4 westward → cursor ended (81,77) ✓ matches get_state trajectory (that was before brakes/corkscrew). So current topology: ...E-corner... west leg from (81,77)... four flats to (77ish?), then brake + corkscrew which REVERSED us east at (80,74). To salvage: from (80,74) continue EAST-SOUTH area? We're at y74 (lake fringe but airborne z144). Heading east: travel to x~90, then U-turn north (left turns from dir2→dir1) rising/flat to lane y79?? But that north-bound column crosses y75-79 zone between x90-93 — past the E-corner structures (max_tile_x will be ~89)! So a clean corridor EAST of everything: x≥90! Map limit 120 ✓ grass presumably extends (map showed flat grass around 60,60 and bounds 20-120). Then at north side turn WEST onto new lane y80-ish?? BUT west-corner geometry targets row B y79/z112 with R5/R5 flip (+1,+5). If I reroute onto ANOTHER parallel lane (y80 vs 79) adjust final alignment with a turn_3 pair or banked straights before the west corner... also must descend z144→112 exactly (−32: two down-kits). Also collision check for new eastbound detour at y74 crossing under/over NOTHING existing (row A sits y82-84 region x≤89; lake above irrelevant). North column at x~91 turning left twice: L5 from dir2 (delta (2,3)) exit dir1; travel north few flats; L5 from dir1: base k=(1−2)=−1≡3: Rot³(2,3): Rot¹(3,−2); Rot²(−2,−3); Rot³(−3,2)? apply (y,−x): v=(−2,−3)→Rot=( −3, 2). Exit dir 1+3=4≡0 WEST ✓ delta (−3,2): position moves WEST 3 NORTH 2. Net across pair: L5a (2,3) then L5b (−3,2) + intermediate flats (0,+n) → final x roughly x0+2−3+.. net ≈ same x, y rises by 5+n. From y74: flats n=? want exit row y80: y gain 6 → need n=... 3+2+n=6 → n=1 single flat between turns. Entry x_E east-extent ~x92: positions: L5a entry (Xe,74) → ep (Xe+2,77); flat → (Xe+2,78); L5b → ep (Xe−1,80) heading WEST ✓ exit column x=Xe−1 ≥ 89 → Xe ≥ 90: so extend eastward from 80 to Xe≈91-92: 11 more east flats before turning — GREAT: fill them with a wave crest (airtime!) since we're boosted? Post-corkscrew energy unknown; add booster sp26 early in the detour, plus one loop?? Third inversion opportunity!! Entering loop needs ftu25 kit as usual. Lane y74 with drift +1 (RVL-from-dir2 is (2,−1) → SOUTH y73!! too close to lake edge water-wise but AIRBORNE z150+ so legal...) choose LEFT_vertical_loop from eastbound: base (2,+1) → drifts NORTH into y75 (lake interior row but high altitude fine). Hmm supports in water—avoid: keep RVL? Its −1 exits y73 at x~88.. y<75 IS over-lake rows regardless of handedness near these x! Lake spans x68-85: our detour x>85 EXITS the lake's x-range! At x≥86, rows y70-75 are dry grass (probably). Risk small either way; place loop Kit at x~83-86 BEFORE clearing lake... no wait detour STARTS at (80,74) inside lake-x-range; building any structure there at low z risks "below water" only if z < surface. z144 is 32 above base ground level — surface of lake likely ~z112±8 — safe by ≥24. It'll render as splash zone pillars, acceptable.… (7561 chars)

Now at (98,73) heading east z144. Loop #3 placed (drifted us to y73 as expected). Hairpin: L5a entry at cursor (98,73): ep (100,76); L5b immediately: from dir1 → delta (−3,2), exit dir0: ep (97,79). Then westbound leg at y79 z144. From (97,79): west run to corner entry ~x31-32: 65 tiles. Content plan: - down-kit A: ftd25,d25,d25tf (−32?? that's −32! wait ftd −8, d25 −16, d25tf −8 = −32 → z112 in one shot ✓) Hmm z112 early leaves NO room for any more ups? Waves are neutral ✓ loops kits neutral ✓ fine — but better keep SOME altitude for variety: do ONE down-kit now (−32→112)? OR split: down-kit(−32) then a wave... let me just keep z144 for now and insert content; descend right before corner: Content from (97,79): W1: brake sp20, RVL kit again (4th loop!? intensity risk with 4 loops at 21-entry each: posG ~3.9 seen before — acceptable) — drift +1 → y80?? Lane creep northward toward y80..81 while corner needs 79!! Balance later with sbend_left adjustments. Hmm lane management across 60 tiles is getting fragile. KISS alternative: NO more loops; instead waves + camelbacks (2× crest valleys, low-G airtime adds) + boosters/brakes. Length still large. Sequence (westbound from 97): 1. flat 2. brake sp19 3-9. waveA (ftu,up,u2f,f,ftd,d,d2f) net0 → x90,y79,z144 10. flat 11. booster sp26 12-13. ftd25,d25tf (−32 → z112!) x87 14-24. waveB ×1 (8pcs incl pad flats): net0 x79 25. brake sp17, then pads... 26+. flats till corner entry computed by live read... then R5,R5,flat pipeline to close on (34,84)... CAREFUL exit math: hairpin earlier: entry row 79 flip exits 84 ✓ station row. Corner must be positioned like build-1-successfully-closed build#1 (entry Xe=33 worked; build 2 untested). With west run starting x97, plenty of padding control — final placement done interactively using get_state numbers exactly like build 1's ending (which closed cleanly at first try). Batch next: items 1-13 → read state.

WAIT — cursor is (111,73) heading dir2 EAST?! I expected to be at the hairpin already heading west. Let me re-read my last batch... Oh no. I see — after the loop kit, cursor was (98,73) dir2 (eastbound). My batch: flat(99), brake(100), wave eastward... the whole batch ran EAST (dir2) — I FORGOT THE HAIRPIN TURNS entirely! The "hairpin" pieces L5/flat/L5 were never included in that batch; I mentally skipped from plan-sequence into content. Current: (111,73) z128 dir2 eastbound, 88 pieces. x=111 approaching map edge 120 ✓ still legal. Y73 fine. Fix: extend slightly to x~113 then hairpin LEFT (north): L5a (from dir2: delta (2,3)) exit dir1; L5b from dir1 (delta (−3,2)) exit dir0 → net entry row +5: y73→78?? hmm need final corner-flip math consistent with station approach (exit row must be 79 for the R5/R5 flip that lands on 84). Hairpin rise = 3+2+flat_between: want exit 79: 73+3+n+2=79 → n=1 flat between turns ✓ same as before. Then z must drop 128→112 pre-corner: exactly −16 via one ftd25+d25tf pair mid-west-leg... wait earlier down-kit: ftd25+d25tf = −8−8=−16 ✓ yes pair is −16 not −32 (I mislabeled above but current z after those two was 144−16=128 CORRECT observed ✓). Remaining x-run for return features: hairpin exit ~(111−1,79)=x110 → west 78 tiles of runway!! That's a LOT of empty track to fill... waves×4 (32pcs), loops kit ×1-2, brakes etc. Time per batch is fast (~1 call each); maybe 3-4 more batches fine. Cost/risk low. Execute now: flats ×2 (→113,114?), hairpin L5,flat,L5, then checkpoint. Note L-turn direction: from EASTBOUND dir2, turning LEFT goes toward NORTH (+y, smaller lake-ish side? y increases northward: our detour is SOUTH belt y74ish so turning left (+y) climbs rows back toward y79 ✓ correct). Careful L5b delta sign vs earlier analysis — empirical check via get_state readout right after placing L5a.

Now westbound at (111,78) z128. Consecutive L5s worked (net x−1?? from 114: entry (113,73)? pieces: flat at (112,73)→ep(113,73); L5a ep (115,76); L5b ep (112,79)?? observed final (111,78)... hmm whatever — real numbers say (111,78) dir0. One row short of ideal 79 → adjust later with an s_bend (from dir0, s_bend_right drifts +1 to y79 ✓ per earlier ledger... verify then). But careful — my corner-flip R5/R5 exits +5 rows: entry y79 → exit y84 ✓ station. Current row 78 → exit 83 ✗ MISALIGNED by one! Fix with s_bend_right early in the leg (drift +1). Its delta from dir0 = (3 tiles fwd? Rot² of (3,−1)): Rot¹(−1,−3); Rot²(−3,1)?? that's dy +1 ✓ but dx −3 extra advance − fine. Plan west leg (~76 tiles): 1. s_bend_right → (108,79) 2. brake sp18, waveA-crest... Fill content generously; watch lane integrity vs loop kits (RVL-from-dir0 drifts +1 per earlier derivation!! confirm empirically when placed). 3. Mid: one more loop kit? We have 3 loops; a 4th adds inversions reward but each loop kit is 8 pcs incl brake — good length filler too. Lane: if drift +1 → y80 ✗ overshoot. Use LVL-from-dir0 instead: delta = Rot² of base (2,1): Rot¹(1,−2); Rot²(−2,−1): dx −2, dy −1 ✓ stays/lower lane. But wait does drift even apply going WESTBOUND mid-kit? yes. So plan: after some waves: [brake19] ftu25(up),up25,LVL,d,d,d2f net0 drift −1?? lane creep south again — balance with another sbend_right later before corner. 4. Two bunny-hop waves (16pcs). 5. Second down-pair (ftd25+d25tf) → z112 BEFORE corner zone. 6. Pads flats until corner entry exactly per live-read. Total est: ~8+3+9+9+2+4+10 ≈ 45 pcs → lands near x~63?? Hmm runway too long — more waves/loops as needed live. Just proceed in chunks; each get_state recalibrates. Batch now: sbend_right, brake, wave (7 incl pads), RVLkit-lite? Compose: [s_bend_right, flat, brakes18, ftu25, up25, u25toflat, flat, ftd25, d25, d25tf, flat, booster24, flat] → neutral except sbend (+1 lane & resets pace), brake before crest tames negG... but brakes+booster adjacent okay. positions: entry(111,78): sb ep (108,79); flat(107); brake(106); ftu(105,137); up(104,153); u2f(103,161 crest); flat(102); ftd(101,153); d25(100,137); d2f(99,129)?? WAIT down_25_to_flat lands −8: from slope-down25 state z137 −8 = 129?! Mismatch — check: standard descent chain reaching flat: ftd25(−8, enter slope dn25), d25(−16), d25tf(−8) total −32; crest was 128+32=160 not 161; ... my batch: crest via ftu+up+u2f = 8+16+8=+32 → z128+32=160 ✓ at (103); ftd25 (102): 152; d25 (101): 136; d2f (100): 128 ✓ back to base-of-wave 128 not 129 — arithmetic error above (misc added 8). Fine: sequence returns to z128 ✓✓ (128−0=128 since net0 ✓) positions shift though: expected cursor ~ (99?) Let me stop hand-simulating; read live output each time (it gives exact cursor). GO.

(97,79) z128 dir0 ✓ aligned on row 79. Now fill the long west runway with content, then descend −16 before corner, then pads to entry. Next batch: wave with more airtime + loop kit #4 (LVL to protect lane) + second wave: 1-8: ftu25,up25,u25tf,flat,ftd25,d25,d25tf,flat (net0) 9: brake sp20 10: ftu25 11: up25 12: up25 13: left_vertical_loop (drift −1 → y78 temp) 14-16: d25,d25,d25tf 17: s_bend_right (+1 → back y79) 18-19: ftd25? no — keep z 128; just flats Execute and read.

Rejection at index 9 (`flat_to_up_25`, the second climb after loop #4?? wait index 9 of that batch = "flat_to_up_25" — let me map: items 0-7 wave (all placed), 8 brake (placed), 9 ftu25 REJECTED "in the way"). Why? Position at rejection: entry x97... wave ended ~x89, brake x88, then climb piece at (87,79)?? What's in the way there?! Row A outbound occupied y83-84 near x58-90; E-corner columns around x84-88 between y76-83!! The rejected climb sits UNDER/near the E-corner turn zone (x87-88,y78-80 area where corner pieces + pads run y77-83). COLLISION with existing track geometry. Also note placed count says total_placed=112 but earlier readouts said 103 pre-batch → 9 placed this call ✓. Current cursor: unknown exactly; get_state to verify. Then fix: shift content WEST only (beyond corner's x-extent) OR avoid climbs here entirely (flat filler + small crest impossible without up pieces... loops also create tall structures!). Everything from now westward must stay clear of the corner zone columns. Safer: descend NOW to z112 and keep z112 content-only flat/waves to x<55, then resume elevation games if any. Simplest: place flats until x≈60, then wave+descent−16, then pads to corner. Loops elsewhere: SKIP a 4th loop (3 inversions is fine). get_state first for exact position.

Cursor (88,79) z128 dir0, 112 pieces. Wait — the LVL loop #4 didn't happen (rejection stopped batch at index 9 which was the ftu25 AFTER the brake; the wave+brake went through but the second climb failed). Looking at placed tail: ..."flat","brakes sp20" — so we're at cursor right after the brake: (88,79). Hmm interesting: total 112 = prior 103 + 9 ✓. Fix path: from (88,79) flat-fill west past corner zone; x81-87 region contains corner pieces at y77-83... The westbound row B/R equivalents must not overlap those columns. Corner pads ran y77-84 columns x~80-88 — at y79!! DANGER: our current y79 line at x≤88 will run INTO the E-corner pad columns?? They occupied y77-78 (after R5a flat → (85?,77)) hmm build1's equivalent had corner exit pads at y77 crossing x76-81 while return leg came later at same rows and DIDN'T collide because it approached from further west/behind... In build 1, closing row was ALSO y77 initially then sbend to 79 wait no: build-1's final closed track: outbound row A up to E-corner (x77→(84,79)... final closure via R5,R5 at (33,79)... Build 1 total track NEVER crossed columns conflictingly because each leg had its own band. Now in build 2: E-corner zone x80-89 spans lanes y74(corksc?)-84 vertically; our west return at y79 running into x88 area is exactly where "corner pads after R5b" sat: from piece list: ..., s_bend_left, R5, flat, R5, flat×5, THEN brakes sp23 + corkscrew!! Those flats after R5b ended at... earlier readout said that sequence delivered cursor (81,77) BEFORE corkscrew started. So the corridor y77 x77-81 + corner turns at x82-89 lanes 77-83 are TAKEN. At y79 heading west starting x88: what occupies (87..84, 79)? From ledger: after s_bend_left (drifted +1 north... entry lane was y82? position: boost26,sb_right(y83),flat, wave8, sb_left(+1 → y84?? no wait build2's s_bend_left drifted back to... I modeled identical-to-build1: entry lane y83→corner R5/flat/R5. Pieces consumed at rows: R5#1 ep≈(x+2,y−3)=y80; flat y79!!! THERE: the "flat" between the two R5s sits at y79 around x86! And our current westbound line AT y79 will collide exactly there (piece "in the way" would be reported once reaching x~86: currently collision ALREADY fired at x87 climb because climb+z-height pokes the R5a piece ABOVE/NEAR). Path forward: avoid x83-90 at y79. Immediate move: shift DOWN a lane before entering that zone: from (88,79), can I place a turn/small drift WESTWARD safely at y78 or below? The corkscrew turnaround occupies (78-80, 73-75); south lane y75-76 near x85+: R5a-from-dir2 ep was (~88,80)? ugh precise corner occupancy uncertain without screenshot. PRAGMATIC: take screenshot NOW to SEE the geometry & free space, then route visually. One call, big clarity.

HUGE revelation — the MAP is completely different from my mental model!! This is a diamond-shaped island with a big central lake, and my whole track is INSIDE the central area... wait no. Looking carefully: - The coaster (yellow/orange) is a compact figure around the lake in the CENTER of the map, x roughly 30-115 tiles... The lake is the CENTRAL pond (teal, center). The gray fence line marks the park boundary circle-ish. The station is at bottom-left with entrance plaza, trees, paths. - Coordinates: the map is a diamond ~140×140 tiles (20-120 range matches). The LAKE sits in the CENTER around tiles (68-85, 55-75)?? The teal pond in the image center — and my track circles it! So my track: outbound leg runs along the top-right (the lift going up along the northeast edge over brown cliffs?! The brown ridge top-right is TERRAIN — a cliff/plateau!). The lift with red supports runs along the north side of the lake. The loops are the two circle shapes left of lake center. The corky... the s-curves along the lake south shore, and the long straight legs at bottom-left heading back toward the station at far bottom-left. Current cursor (88,79) — in the image that's the leg just below the lake's south shore, heading west (down-left). The track ahead (west of x88 at y79) — looking at image, that region south-west of lake is EMPTY GREEN ✓✓ So actually the collision at (87,79) was with the E-corner pieces which I can see as the orange section hugging the lake's SE corner... The East corner + corkscrew + loops all crowd around x80-92,y73-84. Continue west from (88,79) at LOW z (no climbs) through the open green area — the path down-left toward the station looks clear until the final flats near the station (which are at y84!! different row ✓). KEY CHECK: the closing corner at (33,79) area + approach flats at y84 x31-34: the station plaza/entrance buildings were auto-placed in build #1's test?! In THIS build #2 (unfinalized), the plaza from the FIRST test... the screenshot shows entrance plaza & buildings at bottom-left — those persist from the finish_and_test of build #1?? But we DEMOLISHED build 1... and yet plaza structures appear?! Interesting — actually finish_and_test auto-places entrance/exit; after demolish+rebuild the new ride 0 got... the screenshot might show build-2's PRE-PLACE... whatever: risk: the west corner pieces may hit the entrance plaza structures near station! In build 1 the identical corner+approach placed & tested FINE (test ran, train completed) — the plaza accommodated. Actually WAIT: build-1's plaza was placed AFTER full track existed; entrance placement just picked a free adjacent tile. Should be fine again. Continue: flats from (88,79) down to ~x55 (33 flats!) — chunk in two calls of ~20 with a small wave mid-way?? Waves need ups which are LOW structures (crest z128+32=160, supports short) — the collision was only near corner zone; west of x83 should be clean. Try modest: [flat×6, ftu25, up25, u25tf, flat, ftd25, d25, d25tf, flat, flat×6, brake17, flat×6] → then read & continue to corner entry. Then final: descend −16 (ftd25,d25tf) somewhere x~40, pads to (33,79), R5,R5,flat → close on (34,84)!! Wait EXACT closure math from build 1 (which closed successfully): entry cursor (33,79)?? Build-1's closing call: entry was x37... pieces: 5 flats → cursor 32; R5,R5,flat → endpoint (34,84) ✓ closed. So entry must be cursor x32 EXACTLY at y79 z112?? Build-1 z at corner was 112 ✓ (already descended). And row must be EXACTLY y79 (it was: "...flat×4 after wave → (37,79)" then flats →32 ✓). So target: descend to 112 BEFORE x~40, align y79, land cursor (32,79), then [R5,R5,flat] closes. GO.

Even a PLAIN FLAT at (87,79) is rejected — "in the way". So the collision isn't about height: the corner structure occupies the tile (87,79) itself?? But get_state said cursor (88,79) — the next flat goes at (87,79) which is occupied by... the E-corner pad pieces! Recall build-2's sequence: "s_bend_left","right_turn_5","flat","right_turn_5","flat","flat","flat","flat","flat" — that delivered cursor (81,77): so pads ran from (~87,80) through (81,77)?? Those flats were placed heading dir0 at rows... R5b exit endpoint ~ (86,80)? then flats west: (85,80),(84,80),(83,80),(82,80)→(81,80)?? but final readout said (81,77)!! so R5b must have exited LOWER (y77): i.e., those pads sit at y77: tiles (86..81,77). Then brake sp23 at (80,77), corkscrew up started (79,77)... lcs_up delta measured: from (79,77)?? observed exit of cs_up = (78,75). And cs_down exit (80,74) — wait cs_down placed FROM (78,75) dir3: its endpoint (80,74) meaning delta (+2,−1). SO occupied: (80,77),(79,77),(78,75),(80,74) + corner structures x82-90 lanes y77-84 (loops/kits on row A too: the loop #2 kit at y82-83 x73-81!! RVL drift +1 → y83; wave pieces y83; s_bend_left y84;...). Why is (87,79) blocked?? The first R5 of E-corner: entry was at cursor after s_bend_left: which readout showed post-corner-pads exit... I derived entry (87,84)?? R5a ep (89,81), flat (89,80), R5b ep (86,78)... hmm none at (87,79) EXCEPT turn pieces sweep through INTERMEDIATE positions? In RCT2 a turn_5 piece occupies the 3×3 area tiles it spans! A right_turn_5 from dir2 at (86,84) sweeping right occupies tiles including (87,79)?? The piece spans 2 forward + 3 lateral — its footprint is like 3 tiles lateral band... The tile (87,79) could be inside R5b's 3-wide footprint. YES — turn pieces occupy a 3-tile-wide swath. That's why round-1 memory noted column poisoning ±1 tile! CONSEQUENCE: my westbound y79 line must JUMP the corner footprint band: blocked tiles ≈ x84-88 at y77-81. Solution: route the return leg on a DIFFERENT ROW — e.g., y81 (between corner's lower edge y77-78 pads and row-A loop lane y82-83?? that's squeezed) — or y80?? Also blocked likely (R5b swath). Or drop SOUTH: y75-76 (below the corky area, above lake edge y75... tiles x84-88 at y75-76: corky occupies (78-80,73-75): x-range doesn't overlap x84+ ✓!). South-lane y76: from (88,79) can't shift down without turns occupying more tiles... ALTERNATIVE: jump OVER: place the return leg at HIGHER z crossing the corner zone elevated?! Can't — no energy/height budget here (z128 → could climb via ftu+up... but that was the rejected piece (it was rejected due to TILE occupancy, not height!). Hmm. What about approaching from further north: the corner footprint covers y77-81 x84-90 roughly; row A features sit y82-84 x58-92 (loops wave etc occupy y83-84 up to x87ish: "wave" after loop#2 at y82-83 x74-81, s_bend_left x82-84 y84, corner x85-90 y77-84). North of row A: y85+ is FREE (grass) all the way!! Could route return leg at y85?? Then final corner flip R5/R5 from y85 exits y90 ≠ 84 ✗. Would need final approach turn_3s to tuck back... turn_3 also has swath but narrower. Cleanest: continue WEST on y79 is blocked only in x84-88. What if I jump the block by TAKING THE EXISTING TRACK: no... NEW IDEA — use the FREE western gap: the blocked zone is only ~5 tiles wide (x84-88). Everything west of x84 at y79 should be FREE (grass, per screenshot the area below-left of lake shore is open; build-1 had used y77-79 corridor x31-76 though!! In BUILD 2 the west area is EMPTY (we never built there — west return leg hasn't been built yet in this build!). ✓ So only the x84-88 y77-81 pocket blocks. MANEUVER: from (88,79) do a small SOUTH-bound dip: use right_turn_3 (from dir0: delta? base (1,−2) k=2: Rot²(1,−2): Rot¹(−2,−1); Rot²(−1, 2)?? applying (y,−x): (−2,−1)→(−1, 2): so delta (−1,+2) exit dir 2+2... exitbase 3 +2 = 5≡1?? hmm that heads +y (NORTH). WRONG direction. left_turn_3 from dir0: base (1,2): Rot²(1,2): Rot¹(2,−1); Rot²(−1,−2) → delta (−… (15422 chars)

left_turn_5 from (88,79) also rejected — its swath must overlap existing pieces. The L5 sweeps forward-west 2 + lateral 3 south (to y76)... its 3-wide band covers x85-88, y76-79 → hits corner pads (85-86,77-78) or R5b swath. Blocked. Retreat plan it is: undo ×9 back to (97,79), then plan-B north hook FIRST (L5 north?? from (97,79) north hook: left_turn_5 from dir0 → exit dir3 south ✗ wrong direction; RIGHT_turn_5 from dir0: delta Rot²((2,−3)) = (−2,3)?? recompute: base (2,−3): Rot¹ = (−3,−2); Rot² = (−2, 3): dx −2 dy +3 exit dir 1 NORTH ✓!! From (97,79): R5 → ep (95,82) northbound; flats ×2 → (95,84)?? row A occupied at y83-84 near x92-97?? row A features (wave after loop2, s_bend_left) sat x74-84; corner x85-90; the tail pads (85..81,77)... At x95 y82-84: what's there? Row A's late pieces: "flat","s_bend_left" around x82-85... corner R5a entry (86,84)?? R5a at (86,84)→ep(88,81); flat (88,80); R5b ep (85,78); pads west (84,78),(83,78),(82,78),(81,78) then brakes(80,78)?? hmm earlier I read pads ending (81,77) — s_bend_left placed BEFORE corner shifted lane: whatever. The area x91-97 at y82-85: the loop#2 kit was x73-81; wave x74-82; so x91+ y82-84 likely FREE (only map-edge?). The north hook at x95-97 → lane y85+ → then turn west ABOVE row A: from northbound (95,85): L5-from-dir1: delta Rot³((2,3)) = (−3,2) exit 0: ep (92,87) westbound y87 ✓; long west run y87 (clear of everything ✓ row A max y84); at x~60: R3-pair down to y79... from westbound y87: R3 (from dir0: delta (−1,2) exit 1 NORTH ✗ wrong; want SOUTH = dir3: left_turn_3 from dir0: (−1,−2) exit 3 ✓) → ep (59,85) southbound; flats ×6 → (59,79); R3-from-dir3 ((−2,−1) exit 0 west) → ep (57,79)?? delta: (−2,−1): ep (57,78)?!? hmm from (59,79): ep = (59−2, 79−1) = (57,78) ✗ row 78. Adjust: add one more flat → southbound to y80 → ep (57,79) ✓. Fine — details at live-read time. North-route Y-budget: climb +8 rows then descend — all at z128 constant, legal ✓. Execute undos ×9 now. Then R5 north hook.

Clean at (97,79) z128 dir0, 103 pieces. Now north hook: right_turn_5 from dir0 → delta (−2,+3) exit dir1 northbound: ep (95,82). Then flats ×2 → (95,84). Check acceptance live — if R5 north hook collides with something (row A tail at y82-84 x95?? row A max_x was ~90), it should be free.

North hook worked: R5 (95,82), flats (95,83),(95,84), L5-from-dir1 → ep (92,86) heading WEST on y86, z128, clear above row A (max y84). Now long westbound run at y86 → target turn-down at x~60: Content filler (net-zero waves + brakes + boosters), then R3-pair down to y79 near x60, descend −16, fill, corner entry (32,79), R5,R5,flat close. Distance x92→60 = 32 tiles: fill with wave (8), brake+wave (8), booster, wave (8) ≈ 27 → x~65; then hook down: at (65,86): L3-from-dir0 (−1,−2 exit 3 south) → ep (64,84); flats ×5 → (64,79); R3-from-dir3 (−2,−1 exit 0) → ep (62,78)?? need y79: flats ×6 → (64,78): ep R3 = (62,77)?? hmm: from (64,78) R3 ep (62,77) ✗ row 77; from (64,79) R3 ep (62,78) ✗... The R3-from-southbound delta dy −1 lands one row SHORT: enter at y80: ep (x−2,79) ✓✓: southbound flats to y80 → R3 → westbound y79 ✓. THEN at (x−2?,79) heading west: descend ftd25+d25tf → z112; waves/pads to (32,79); close [R5,R5,flat]. Wait check R3-from-dir3 delta AGAIN: base for right_turn_3 (dir2): (1,−2) exit 3. k = (3−2)=1: Rot¹((1,−2)) = (−2,−1). dy −1 ✓ as used. Enter southbound at y80 → exit west at y79 ✓. Also southbound column x64 y79-86: crosses row A band y82-84 at x64!! Row A occupied y84 x34-58 (stations lift drop) and y82-84 x58-92 (loop1 kit y83-84?, s_bend, corner) — at x64 y82-84: loop#1 kit region? Loop1 kit was at x61-69 y83-84 (ftu at (62,84) up ups loop (65,83)...). CONFLICT LIKELY at (64,83)/(64,84)!! The southbound column must cross those rows SOMEWHERE — choose a GAP: row A pieces are continuous along its whole length (it's a track!). BUT: crossing at DIFFERENT Z is legal!! z128 elevated vs row-A surface z at x64 ≈ 128-160 (loop kit area z ~128-176). SAME z overlap = collision; my southbound flat pieces at z128 crossing tiles where row A sits at z160+ (the loop climb section!) might be FINE if row A there is HIGHER. At x64: ftu25(63? z136) up25(64? z152)... too close to 128 ✗. Shift crossing WEST to x56-58 where row A is the DROP (down60 at z ~336→160: at x56-58 z = 336−24−64−64... : ftd60 at x55? crest 336 at x54; drop pieces x55(312),56(248),57(184), d60tf (58,160)? So at x56 z≈248 ✓✓ my y79-86 crossing at z128 clears UNDER (need ≥16 gap? z gap 120 ✓✓). Or crossing where row A is at GROUND: x59-60 (z128 same ✗). New crossing column: x57: from westbound y86 at x57: L3 → (56,84) z128 — is (56,84) free? Row A at x56 is down_60 piece occupying (56,84) at z248!! Its TILE is occupied but at much higher z — can two track pieces share a tile at different heights? In RCT2 generally YES for different heights (that's how bridges work) — memory said "track passing OVER the station at higher z does not close and doesn't collide either" ✓. So placement should succeed. Then flats south (56,83),(56,82),(56,81),(56,80) [z128; row-A below is at z336..184 heights — clearance: at (56,81) row A track z~216?? gap ~88 ✓; at (56,80) row A z 184?? still high ✓]; enter y80; R3 → (54,79) westbound ✓ (row A at x54: crest u25tf z336? x54 was "u25_to_flat" plateau ✓ high). Hmm wait southbound flats: from (56,84): flat→(56,83), flat→(56,82), flat→(56,81), flat→(56,80) = 4 flats then R3 ep (54,79) ✓. Then westbound y79 from x54 z128: descend pair → 112 at x52; content: wave(8) x52→44; brake; pads → 32; CLOSE [R5,R5,flat] → entry (32,79) exact ✓ (west-run ends: from x44: flats: 43..33 = 11 pads, cursor 32 ✓). TOTAL remaining ≈ 27(waves/hook... ) let me batch: Batch A: wave(8): x92→84 @y86; brake17 x83; wave(8) x82→74?? minus brake: wave 8 + brake = pieces... just place and read. GO.

At (73,86) z128 westbound. Continue: one more wave, then hook down at x57. From x73: wave(8) → x65; flat → 64; flats more → hook entry x57?? gap 64→58: 6 pads... then L3 at (57,86) → ep (56,84); flats ×4 → (56,80); R3 → ep (54,79) westbound ✓. Batch: wave(8), flat, flat, flat, flat, flat, flat, L3, flat, flat, flat, flat, R3 → then read. Count: 8+6+1+4+1 = 20.

Interesting — landed at (56,79) directly (the R3 from y80 with the flats gave dy −1; live numbers trump my arithmetic; we're westbound y79 z128 ✓). Remaining to corner entry: 56 → 32 = 24 tiles: descend −16 (ftd25,d25tf), wave(8), brake, pads → 32, then close. Count: 2 + 8 + 1 + (pads 56−16−8−1...) compute after read. Batch: ftd25, d25tf, wave(8), brake sp17, flat, flat → read & finish with pads+corner in final call.

At (43,79) z112 ✓ (descent done, base level). Need cursor (32,79): 11 more flats, then R5,R5,flat → endpoint (34,84) closes. Batch: 11 flats + corner + flat = 14 pieces.

CIRCUIT CLOSED — 173 pieces! Now test. Longer ride (173 vs 101 pieces), 3 loops + corkscrew = 4 inversions, taller lift (224 vs 192). Watch for: train energy sufficiency (boosters placed: 26/27/26/24 + brakes 21/23/19/21/19/17 at strategic spots), no valleys. Test with default ticks.

Ouch — intensity 14.53 → excitement crushed to 2.10. Worse than the banked 6.42. Diagnosis: - intensity 14.53 vs build-1's 6.26. G-forces: latG 3.25 (up from 2.13), posG 4.41 (up from 3.89), negG −1.0 (similar). - num_inversions: 3?! I placed 3 loops + 1 corkscrew = expected 4. Maybe corkscrew counted... whatever. - nausea 9.22 (vs 3.22) — very high, correlated with intensity. - ride_time 77 (vs 60): train got slower overall? average 667k vs 522k — actually faster. What drove intensity from 6.26→14.53? Key deltas vs build-1: 1. Taller lift (+224 vs +192 crest... build1 crest was 264+8?? build1: z max 328; build2: 344) → faster everywhere. 2. MORE wave/hill cycles (each crest = negG event; 14 drops vs 8!) — rapid up/down cycles at high speed amplify both vertical Gs AND nausea. 3. Corkscrew pair at speed 23 brake — corkscrews generate strong sustained positive+later G... likely a big contributor (latG 3.25!). R2's corkscrew at brakes-24 produced latG 3.66. Mine at 23 → 3.25. CORKSCREW IS THE LAT-G KILLER, confirmed twice. 4. 3 loops vs 2 → more posG events (4.41 from a loop at higher speed since lift taller). The banked 6.42 remains best. Learning consolidated: - Intensity scales with: number of inversion elements at speed, number of rapid vertical cycles, and latG from corkscrews. - Build-1's magic: FEWER elements (2 loops), taller-but-not-crazy speeds, generous flats between features (ride still 101 pieces), 8 drops. Given ~10 min left maybe, options: A) Stop here — banked 6.42 stands. B) One more surgical rebuild: build-1 EXACTLY + one change only (e.g., lift +2 ups for speed, or a third loop mid-row-A). Risk: unknowns again; but each test is cheap (~1 min). Do B with MINIMAL delta: build-1 clone + third loop kit inserted on the y86 north leg?? Build-1 didn't have north leg... Clone build-1 (101 pcs) and add loop #3 in the middle of row B (replacing one wave) — controlled swap. Expected: +inversion bonus, moderate intensity bump. If intensity ≤ 8-9 → excitement likely > 6.42? Uncertain: R1→R2→today's data: intensity is the master variable. Build-1 at 6.26 intensity → 6.42 exc. Adding a loop kit at braked-20 entry: posG maybe 4.0, intensity → ~7.5-8, excitement up from inversion + length bonus? Plausible gain +0.3-0.8. Actually ALSO worth trying: build-1 + slightly taller lift (+2 ups) alone: more speed → higher excitement (max_speed term) AND intensity rises moderately. Hmm. Choose: clone build-1 with TWO surgical deltas: (1) lift +2 pieces taller; (2) loop#3 kit replacing row-B's second wave (with brake 20). That's ONE build attempt. If it fails, stop with 6.42. Wait — how much time? The conversation has consumed a while; rounds are ~30 min. I've used maybe 22-25 min. ONE more build+test cycle ≈ 5-7 min given ~10 calls. Tight but doable. Demolish and GO FAST: reuse build-1's exact piece list (I have it verbatim in the first test result!) + insertions. I'll replay it in 4-5 place_pieces calls. Build-1 piece list (173?? no 101-piece list) verbatim from first result. Insert after "down_25_to_flat"(of loop1 kit)+... careful to keep positions/closure valid: build-1 closed with corner entry at (33,79) after pads; if I add a loop kit on row B, positions shift WEST earlier... row B content region had spare width (runway from x80 to corner-entry 33 = 47 tiles with content ~20 pieces used in build-1). Adding 7-8 pieces → shift pads accordingly: I'll manage live like before: build row B content, read position, then pad to (33,79) EXACTLY then R5,R5,flat. Also keep lift at build-1 height (don't stack deltas; one variable at a time = the loop). Actually taller lift was a suspected intensifier... skip it. Demolish now, replay build-1 batches: B1: stations... drop (26 pieces, verbatim) B2: loop1 kit etc (11) B3: wave+s_bend_left+corner (12 with plain R5s — note build-1 used plain R5 both: yes "right_turn_5","flat","right_turn_5","flat","flat","flat","flat") B4: row B loop2 kit + wave + sbend_right + booster + descent (as build… (4543 chars)

Replayed build-1 through its Row B booster/descent — cursor (54,79) z112 heading west, exactly matching build-1's state at that point ✓ (build-1 after "booster24,ftd25,d25tf,flat,flat,flat" was (54,79,112) — yes identical!). Now the single delta: loop kit #3 in place of build-1's wave2 + a north-drift correction. Build-1 from here: [ftu,up,u2f,flat,ftd,d,d2f] (wave), brakes17, flat, [wave2], flats... My insert: brakes sp20, ftu25, up25, up25, left_vertical_loop, d25, d25, d25tf, s_bend_right (lane fix), flat — that's 10 pieces (build-1 wave2 region was 8) → +2 pads adjustment later (pad count computed live). Then pads to (33,79) → corner close.

At (41,79) z112 westbound (loop #3 kit landed, s_bend corrected lane back to 79 ✓). Corner entry target: cursor (33,79): 8 flats. Then R5,R5,flat closes at (34,84) per build-1's proven pattern (entry 33 gave exit... build-1: pads ended cursor 32; R5,R5,flat → close. Mine: entry 33: R5a ep (31,82); R5b ep (34,84)?! endpoint ON begin tile directly — build-1 had entry 32 → R5b ep (33,84) + flat → (34,84). For entry 33 the final flat lands on the station tile immediately after R5b... could conflict ("in the way") since R5b ep == begin tile already... Actually closure just requires endpoint == begin tile: R5b's OWN endpoint (34,84) would CLOSE the circuit (matching z/bank/slope ✓). Then the trailing "flat" would place ONTO begin_station → rejected "in the way"!! So: place only R5,R5 and check circuit_closed; add flat ONLY if needed (entry 32 pattern). Safer: pad one MORE flat first: cursor 32 then R5,R5,flat exactly like build-1. DO THAT: 9 flats.

6.55 — NEW BEST! (up from 6.42). Intensity 6.47 stayed flat despite the third loop (brake-20 entry worked), 3 inversions, nausea still low at 3.29. The delta trade: airtime dropped (52 vs 79) and drops 7 vs 8, but inversion bonus + shorter length netted +0.13. Banked now 6.55 via best_result. Quick confirm, then wrap up — budget nearly spent. No style calls (final round only). Also worth updating memory files with this round's learnings? The memory instructions say to save durable findings. I have valuable new facts: corkscrew undo fails, corkscrew = 180° reversal breaker, turn_5 3-tile swath, banked pieces exist in catalog, intensity driver analysis, loop-brake recipe, corner recipes. Update the two memory files with a compact addendum. Keep it quick — two Edit calls. Confirm best_result first.

Banked 6.55 confirmed. Update the mechanics memory file with round-3 learnings, then end with the one-line summary. Keep the memory update compact — append key new facts to rct2-twister-mechanics.md.

Memory updated. Now the final one-line summary as instructed. Round 3 done — best_result = 6.55.