A benchmark in which language models design roller coasters that RollerCoaster Tycoon 2 builds, tests, and rates.
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{"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)
I have full geometry for all 4 directions. Let me plan and build a closed circuit. First, create the ride and check the terrain baseline.
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Terrain baseline is z=112. Now let me build the station and lift, then verify.
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Now the long return legs. Let me place the flats and turns in one batch.
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{"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":50,"y":58,"z":112},"finalized":false,"pieces_placed":72,"placed_pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_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_to_down_25","down_25_to_flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat"],"ride_id":0,"start":{"bank":0,"dir":0,"slope":0,"x":50,"y":60,"z":112},"total_cost":56298}
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{"cursor":{"bank":0,"dir":0,"slope":0,"x":50,"y":58,"z":112},"valid_pieces":["flat","end_station","begin_station","middle_station","flat_to_up_25","left_turn_5","flat_to_left_bank","flat_to_right_bank","s_bend_left","s_bend_right","left_turn_3","right_turn_3","left_corkscrew_up","right_corkscrew_up","flat_to_up_60","brakes","booster"]}
The right turn is blocked by existing track; left turn works. Let me plan a small left-turn loop to close the circuit from (50,58) back to (50,60).
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The L4 turn clips existing track near the station. Let me demolish and rebuild a clean, verified circuit in small chunks.
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The R4 delta was wrong in my plan (right turn from dir3 is dx-3,dy-2 → (58,58), then flats → (50,58)). I need a +2 y correction. Let me check what's valid and plan a corrective left-turn loop.
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left_turn_5 is valid. Placing the corrective loop to close at (50,60).
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The turn landing directly on the station tile fails. Let me try approaching with a straight final piece along the station axis instead.
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The corrective loop crossed the east-west return run at (53,58). Let me undo and plan a tail that goes south, around, and approaches the station head-on along its axis.
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{"cursor":{"bank":0,"dir":1,"slope":0,"x":53,"y":55,"z":112},"pieces_placed":76,"removed":"flat"}
{"cursor":{"bank":0,"dir":2,"slope":0,"x":51,"y":52,"z":112},"pieces_placed":75,"removed":"left_turn_5"}
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Back at (50,58). Now place the full corrective tail.
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The x=61 wall blocks all approaches. Let me demolish and validate the closure mechanism with a minimal clean loop first, then improve it.
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Circuit closed! The straight final flat into the station works. Let me test to bank a baseline score.
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Baseline banked (excitement 0.31). Now building a much better ring with a lift, big drop, banked turns and airtime bumps, all keeping exact z closure.
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{"pieces":["flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","banked_right_turn_5","right_bank_to_flat"]}{"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":30,"y":75,"z":112},"placed_this_call":12,"rejection":{"error":"piece enters right-banked but the track here is unbanked; add a banking transition piece first","index":12,"piece":"banked_right_turn_5"},"total_placed":31}
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Cursor is flat at (51,78). Continuing the east leg, south turn and return.
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Circuit closed with 92 pieces. Let me test this improved ride.
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Scored 5.69 with 0 penalty (similarity 0.467). Let me push higher with vertical loops on the far straight, using a 4-loop cluster with a z-compensating bump. Rebuild.
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The vertical loop needs a 25-up approach. Correct cluster: flat_to_up_25 → left_vertical_loop → down_25_to_flat (net z0). Placing 4 loops.
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Test failed (train lost energy through 4 loops). Let me rebuild with 2 loops plus a booster to maintain momentum.
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{"ticks":25000}{"bounds":{"max_tile_x":66,"max_tile_y":80,"max_z":280,"min_tile_x":30,"min_tile_y":60,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_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"},"up_25_to_flat","flat_to_down_60","down_60","down_60_to_down_25","down_25_to_flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat"],"program":null,"rides":[{"average_speed"… (1923 chars)
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Same failure — the loops seem to stall the test even with a post-booster. Let me try one loop with boosters before AND after it.
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{"pieces":[{"speed":25,"t":"booster"},"flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5"]}{"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":67,"y":76,"z":112},"placed_this_call":15,"total_placed":65}
{"pieces":["flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5"]}{"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":64,"y":60,"z":112},"placed_this_call":15,"total_placed":80}
{"pieces":["flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat"]}{"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":50,"y":60,"z":112},"placed_this_call":14,"total_placed":94}
Closed. Testing with the single loop + dual boosters.
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5.94 banked! One loop + boosters works. Let me try two loops (with boosters before and after each) on the far straight.
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{"ticks":25000}{"bounds":{"max_tile_x":67,"max_tile_y":80,"max_z":280,"min_tile_x":30,"min_tile_y":60,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_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"},"up_25_to_flat","flat_to_down_60","down_60","down_60_to_down_25","down_25_to_flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":25,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat"],"progr… (2002 chars)
6.15 banked with 2 loops. Adding a 3rd loop on the south leg (using right_vertical_loop to stay clear of the lake).
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{"ticks":25000}{"bounds":{"max_tile_x":67,"max_tile_y":80,"max_z":280,"min_tile_x":30,"min_tile_y":60,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_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"},"up_25_to_flat","flat_to_down_60","down_60","down_60_to_down_25","down_25_to_flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":25,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_5","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":25,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"flat","right_turn_5","flat","flat","flat","flat","flat","f… (2062 chars)
← openrouter_deepseek_deepseek-v4-flash-0731 · 20260731-deepseek-v4-flash-design · all runs