TRACE · ROUND 5

A benchmark in which language models design roller coasters that RollerCoaster Tycoon 2 builds, tests, and rates.

claude-fable-5-1 · 20260902-fable51-design-full · round 5 back to model →
events
56
tool calls
42
rejected
1
session
0:00
Session trace

  1. I'll load the coaster tools, then plan a new twister layout based on last round's lessons (intensity was 9.93, right at the edge; excitement 6.87).

  2. ToolSearch
    {"max_results":11,"query":"select:mcp__coaster__new_ride,mcp__coaster__place_piece,mcp__coaster__place_pieces,mcp__coaster__valid_next_pieces,mcp__coaster__piece_geometry,mcp__coaster__undo_piece,mcp__coaster__get_state,mcp__coaster__finish_and_test,mcp__coaster__best_result,mcp__coaster__demolish,mcp__coaster__screenshot"}
  3. piece_geometry
    {"dir":0}
    {"deltas":[{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":0,"dx_tiles":-1,"dy_tiles":0,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":0,"dx… (7397 chars)
  4. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"ride_id":0}

  5. First I'll replay last round's proven 115-piece circuit to bank a baseline score, then iterate on it.

  6. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_… (1822 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":115,"total_placed":115}
  7. finish_and_test
    {"bounds":{"max_tile_x":75,"max_tile_y":60,"max_z":344,"min_tile_x":21,"min_tile_y":42,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_… (2735 chars)

  8. Baseline banked at 6.87. Now I'll fetch the geometry for the other three facings and a screenshot so I can plan an improved, more compact v2 with lower G-forces and more turns.

  9. piece_geometry
    {"dir":1}
    {"deltas":[{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":1,"dx_tiles":0,"dy_tiles":1,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":1,"dx_tiles":0,"d… (7346 chars)
  10. piece_geometry
    {"dir":2}
    {"deltas":[{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":2,"dx_tiles":1,"d… (7346 chars)
  11. piece_geometry
    {"dir":3}
    {"deltas":[{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":3,"dx… (7397 chars)
  12. screenshot
    [image]

  13. With all four facings' geometry gathered, I'll build v2 by shifting the start to (66,60), adding a hump before the first vertical loop to reduce positive G, inserting an S-bend pair in the return leg for extra turns, and lengthening that leg by 6 tiles to keep it closing properly.

  14. new_ride
    {"dir":0,"ride_type":51,"x":66,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"ride_id":0}
  15. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_… (1937 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"placed_this_call":123,"total_placed":123}

  16. Closed on the first try. Testing v2 now.

  17. finish_and_test
    {"bounds":{"max_tile_x":81,"max_tile_y":60,"max_z":344,"min_tile_x":21,"min_tile_y":42,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_v… (2850 chars)

  18. v2 hit 6.91 with intensity at 7.95, leaving room to push further, so I'm building v3 with a third corkscrew pair after the second vertical loop and re-plotting the return leg to close at (66,60).

  19. new_ride
    {"dir":0,"ride_type":51,"x":66,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"ride_id":0}
  20. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_25","up_25_… (1980 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"placed_this_call":125,"total_placed":125}
  21. finish_and_test
    {"bounds":{"max_tile_x":81,"max_tile_y":60,"max_z":344,"min_tile_x":21,"min_tile_y":41,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_v… (2856 chars)

  22. v3 failed—lateral G hit 3.23, triggering the excessive-lateral-G penalty since the corkscrews ran at full booster speed. For v4, I'll place the third corkscrew pair atop a 4-piece climb to slow it down first, keeping everything upstream unchanged.

  23. new_ride
    {"dir":0,"ride_type":51,"x":66,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"ride_id":0}
  24. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","right_cor… (2103 chars)
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":128},"placed_this_call":135,"total_placed":135}

  25. Circuit came back 16 units high: the climb before the new corkscrews is 80 units, but I only descended 64. Rebuilding with one more down_25 and one fewer flat on the return leg.

  26. new_ride
    {"dir":0,"ride_type":51,"x":66,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"ride_id":0}
  27. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","half_loop_up","right_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25","up_25_to_flat","right_cor… (2106 chars)
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":68,"y":60,"z":112},"placed_this_call":135,"total_placed":135}

  28. The circuit overshot by 2 tiles because the leg I shortened runs in -x. I'll undo the last 14 pieces back to the y=46 leg, add two flats, and re-place the ending.

  29. undo_piece
    {"cursor":{"bank":2,"dir":0,"slope":0,"x":69,"y":60,"z":112},"pieces_placed":134,"removed":"left_bank_to_flat"}
  30. undo_piece
    {"cursor":{"bank":2,"dir":1,"slope":0,"x":71,"y":59,"z":112},"pieces_placed":133,"removed":"banked_left_turn_3"}
  31. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":58,"z":112},"pieces_placed":132,"removed":"flat_to_left_bank"}
  32. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":57,"z":112},"pieces_placed":131,"removed":"flat"}
  33. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":56,"z":112},"pieces_placed":130,"removed":"flat"}
  34. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":55,"z":112},"pieces_placed":129,"removed":"flat"}
  35. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":54,"z":112},"pieces_placed":128,"removed":"flat"}
  36. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":53,"z":112},"pieces_placed":127,"removed":"flat"}
  37. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":52,"z":112},"pieces_placed":126,"removed":"flat"}
  38. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":51,"z":112},"pieces_placed":125,"removed":"flat"}
  39. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":71,"y":50,"z":112},"pieces_placed":124,"removed":"flat"}
  40. undo_piece
    {"cursor":{"bank":4,"dir":1,"slope":0,"x":71,"y":49,"z":112},"pieces_placed":123,"removed":"right_bank_to_flat"}
  41. undo_piece
    {"cursor":{"bank":4,"dir":0,"slope":0,"x":73,"y":46,"z":112},"pieces_placed":122,"removed":"banked_right_turn_5"}
  42. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":74,"y":46,"z":112},"pieces_placed":121,"removed":"flat_to_right_bank"}
  43. place_pieces
    {"pieces":["flat","flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"placed_this_call":16,"total_placed":137}

  44. Closed. Testing v4.

  45. finish_and_test
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  46. v4 scored 7.10 (intensity 8.36, lateral G 2.78). I'll iterate to v5, replacing the mid-course booster hill with a third vertical loop for extra speed without added lateral G, and adding S-bends on the slow return leg.

  47. new_ride
    {"dir":0,"ride_type":51,"x":66,"y":60}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"ride_id":0}
  48. place_pieces
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    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":60,"z":112},"placed_this_call":123,"total_placed":123}
  49. finish_and_test
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  50. v5 scored 7.19 with 6 inversions and intensity 8.67. Time is nearly up, so I'll confirm the banked best and stop.

  51. best_result
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  52. Best score is banked at 7.19. I'll save the key lessons to memory for the final round, then wrap up.

  53. Write
    {"content":"---\nname: rct2-twister-lateral-g-rule\ndescription: RCT2 coaster contest - max lateral G above 2.80 adds ~2-4 intensity, above 3.10 halves excitement; corkscrews at full speed are the cause\nmetadata:\n  type: project\n---\n\nIn the RCT2 steel twister (ride_type 51) coaster contest, the eval applies the OpenRCT2 excessive-lateral-G penalty: max_lateral_g > 2.80 adds roughly 2-4 intensity; > 3.10 halves excitement and adds ~8 intensity (round 5 v3 test: lateral 3.23 gave excitement 1.62, intensity 15.07).\n\n**Why:** Corkscrew pairs placed at ground level right after a booster 25 or vertical loop produce lateral G ~3.2. Putting the corkscrew pair on top of a climb (flat_to_up_25 + 4x up_25 + up_25_to_flat, then right_corkscrew_up / left_corkscrew_down, then 80 units of descent) keeps lateral at 2.78 and adds an inversion safely. Vertical loops at booster 25 add no lateral G.\n\n**How to apply:** Best round-5 design (7.19 excitement, intensity 8.67, 6 inversions) starts at (66,60) dir 0, 12-piece chain lift, 60-degree drop, hump then left vertical loop, corkscrew pair, banked turn at height, half loop + corkscrew, right vertical loop, elevated corkscrew pair, hills, thir… (1532 chars)
    File created successfully at: /home/sandbox/.claude/projects/-workspace/memory/rct2-twister-lateral-g-rule.md
  54. Readrejected
    {"file_path":"/home/sandbox/.claude/projects/-workspace/memory/MEMORY.md"}
    File does not exist. Note: your current working directory is /workspace.
  55. Write
    {"content":"- [RCT2 twister lateral-G rule](rct2-twister-lateral-g-rule.md) — keep max lateral G ≤ 2.80; elevate corkscrews; best round-5 layout recipe (7.19)\n","file_path":"/home/sandbox/.claude/projects/-workspace/memory/MEMORY.md"}
    File created successfully at: /home/sandbox/.claude/projects/-workspace/memory/MEMORY.md (file state is current in your context — no need to Read it back)

  56. Round 5 is done. The banked best is v5 at 7.19 excitement, confirmed by best_result. **What happened this round** - **Baseline first.** I replayed last round's 115-piece circuit at (60,60) and banked 6.87 within the first few minutes. - **v2 (6.91, intensity 7.95).** Shifted the start to (66,60), added a hump before the first vertical loop, and put an S-bend pair in the return leg. Intensity fell by two points, which opened headroom. - **v3 (1.62, failed).** A corkscrew pair straight off the booster-25 vertical loop pushed max lateral G to 3.23. That trips the game's excessive-lateral-G penalty, which halves excitement and adds about 8 intensity. The score was discarded automatically since best_result keeps the maximum. - **v4 (7.10).** Same corkscrew pair, but placed on top of an 80-unit climb so the train enters it slower. Lateral G stayed at 2.78 and the ride gained a fifth inversion. - **v5 (7.19, banked best).** Swapped the mid-course booster hill for a third vertical loop at full speed, which adds no lateral G, and added S-bends on the slow return leg. **Final stats for the best ride** | Metric | Value | |---|---| | Excitement | 7.19 | | Intensity | 8.67 | | Nausea | 4.51 | | Max lateral G | 2.78 | | Inversions | 6 | | Similarity to stock | 0.41 (no penalty) | The key rule I learned is to keep max lateral G at or under 2.80, and I saved that plus the winning layout recipe to memory for the final round. Nothing was named or coloured, as instructed. Best coaster: a 123-piece twister with three vertical loops, a half loop, and two corkscrew pairs, excitement 7.19.

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