TRACE · ROUND 6

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

gpt-5.6-sol · 20260727-gpt56-sol-design-full · round 6 back to model →
events
32
tool calls
30
rejected
0
session
0:00
Session trace
  1. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  2. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","fla… (2248 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":134,"total_placed":134}
  3. finish_and_test
    {"ticks":25000}
    {"bounds":{"max_tile_x":64,"max_tile_y":95,"max_z":376,"min_tile_x":21,"min_tile_y":61,"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","dow… (3166 chars)
  4. demolish
    {"demolished":0}
  5. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  6. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","fla… (2328 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":134,"total_placed":134}
  7. finish_and_test
    {"ticks":25000}
    {"bounds":{"max_tile_x":64,"max_tile_y":95,"max_z":376,"min_tile_x":21,"min_tile_y":61,"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","dow… (3259 chars)
  8. demolish
    {"demolished":0}
  9. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  10. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","fla… (2347 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":134,"total_placed":134}
  11. finish_and_test
    {"ticks":25000}
    {"bounds":{"max_tile_x":64,"max_tile_y":95,"max_z":376,"min_tile_x":21,"min_tile_y":61,"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","dow… (3278 chars)
  12. 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)
  13. demolish
    {"demolished":0}
  14. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  15. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","fla… (2342 chars)
    {"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":36,"y":80,"z":112},"placed_this_call":118,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":118,"piece":"flat_to_up_25"},"total_placed":118}
  16. place_pieces
    {"pieces":["flat","flat","flat","flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","flat","right_turn_3","flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":96,"z":112},"placed_this_call":15,"total_placed":133}
  17. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":38,"y":96,"z":112},"pieces_placed":132,"removed":"flat"}
  18. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":36,"y":95,"z":112},"pieces_placed":131,"removed":"right_turn_3"}
  19. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":36,"y":94,"z":112},"pieces_placed":130,"removed":"flat"}
  20. place_pieces
    {"pieces":["right_turn_3","flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":2,"total_placed":132}
  21. finish_and_test
    {"ticks":25000}
    {"bounds":{"max_tile_x":64,"max_tile_y":95,"max_z":376,"min_tile_x":21,"min_tile_y":61,"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","dow… (3262 chars)
  22. demolish
    {"demolished":0}
  23. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  24. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","fla… (2328 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":134,"total_placed":134}
  25. finish_and_test
    {"ticks":25000}
    {"bounds":{"max_tile_x":64,"max_tile_y":95,"max_z":376,"min_tile_x":21,"min_tile_y":61,"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","dow… (3259 chars)
  26. demolish
    {"demolished":0}
  27. new_ride
    {"dir":2,"ride_type":51,"x":39,"y":95}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"ride_id":0}
  28. place_pieces
    {"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"},{"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","flat","right_turn_3","flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":22,"t":"booster"},"flat_to_up_25","right_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":20,"t":"brakes"},"flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat","flat","flat","flat","flat","flat… (2327 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":95,"z":112},"placed_this_call":134,"total_placed":134}
  29. finish_and_test
    {"ticks":25000}
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  30. best_result
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  31. Best coaster: a 1,375 m steel twister with 9 drops, 5 inversions, and **7.81 excitement**.

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