TRACE · ROUND 2

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

claude-opus-5 · 20260727-opus5-design-full · round 2 back to model →
events
54
tool calls
44
rejected
1
session
0:00
Session trace

  1. I'll start by loading the coaster tools.

  2. ToolSearch
    {"max_results":15,"query":"coaster new_ride place_pieces finish_and_test"}
  3. 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)

  4. Loaded. Let me plan geometry and start building.

  5. new_ride
    {"dir":2,"ride_type":51,"x":26,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":26,"y":40,"z":112},"ride_id":0}
  6. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_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"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":62,"y":41,"z":208},"placed_this_call":35,"total_placed":35}
  7. place_pieces
    {"pieces":["flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":50,"y":34,"z":160},"placed_this_call":13,"total_placed":48}
  8. place_pieces
    {"pieces":["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_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":32,"y":37,"z":112},"placed_this_call":17,"total_placed":65}
  9. place_pieces
    {"pieces":[{"speed":15,"t":"brakes"},{"speed":15,"t":"brakes"},"flat","flat","flat","flat","flat","flat_to_right_bank","banked_right_turn_3","banked_right_turn_3","right_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":26,"y":40,"z":112},"placed_this_call":11,"total_placed":76}

  10. Circuit closed on the first attempt. Testing to bank a score.

  11. finish_and_test
    {"bounds":{"max_tile_x":65,"max_tile_y":41,"max_z":456,"min_tile_x":23,"min_tile_y":34,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_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","flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_down_25","down_25","dow… (2424 chars)

  12. Intensity 14.3 crushed it. The full-speed turnaround right after the drop is the culprit. Rebuilding with an uphill turnaround and gentler G-loading.

  13. demolish
    {"demolished":0}
  14. new_ride
    {"dir":2,"ride_type":51,"x":32,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"ride_id":0}
  15. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","right_turn_5_up_25","up_25_to_right_bank","banked_right_turn_5","right_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":66,"y":33,"z":272},"placed_this_call":39,"total_placed":39}
  16. place_pieces
    {"pieces":["flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_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_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_down_25","down_25_to_flat","flat_to_up_25","up_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_down_25","down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":35,"y":32,"z":112},"placed_this_call":28,"total_placed":67}
  17. place_pieces
    {"pieces":["s_bend_right","s_bend_right","s_bend_right","flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat",{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"}]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"placed_this_call":12,"total_placed":79}
  18. finish_and_test
    {"bounds":{"max_tile_x":70,"max_tile_y":40,"max_z":440,"min_tile_x":23,"min_tile_y":29,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat_to_up_25","right_turn_5_up_25","up_25_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to… (2540 chars)

  19. 6.47 banked (intensity 9.73). Now adding drops/airtime and banking the turnaround to cut lateral G.

  20. demolish
    {"demolished":0}
  21. new_ride
    {"dir":2,"ride_type":51,"x":32,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"ride_id":0}
  22. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":71,"y":34,"z":272},"placed_this_call":43,"total_placed":43}
  23. place_pieces
    {"pieces":["flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_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_25_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":33,"y":33,"z":112},"placed_this_call":35,"total_placed":78}
  24. place_pieces
    {"pieces":[{"speed":13,"t":"brakes"},{"speed":13,"t":"brakes"},"s_bend_right","s_bend_right","flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat",{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"}]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"placed_this_call":14,"total_placed":92}
  25. finish_and_test
    {"bounds":{"max_tile_x":75,"max_tile_y":40,"max_z":440,"min_tile_x":22,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","do… (2745 chars)

  26. Banked **6.63** (beats last round). Now trying a 5-inversion variant.

  27. demolish
    {"demolished":0}
  28. new_ride
    {"dir":2,"ride_type":51,"x":32,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"ride_id":0}
  29. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_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_25_to_f… (1414 chars)
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":39,"y":33,"z":128},"placed_this_call":72,"total_placed":72}
  30. place_pieces
    {"pieces":["flat_to_up_25","up_25","up_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_down_25","down_25","down_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":13,"t":"brakes"},"s_bend_left","flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat",{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"},{"speed":10,"t":"brakes"}]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":32,"y":40,"z":112},"placed_this_call":23,"total_placed":95}
  31. finish_and_test
    {"bounds":{"max_tile_x":75,"max_tile_y":40,"max_z":440,"min_tile_x":21,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","do… (2792 chars)

  32. 6.74 banked. Now testing whether trimming corkscrew speed drops intensity below the penalty threshold.

  33. demolish
    {"demolished":0}
  34. new_ride
    {"dir":2,"ride_type":51,"x":34,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"ride_id":0}
  35. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_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_25_to_f… (1991 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"placed_this_call":99,"total_placed":99}
  36. finish_and_test
    {"bounds":{"max_tile_x":77,"max_tile_y":40,"max_z":440,"min_tile_x":21,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_down_25","do… (2895 chars)

  37. Intensity fell to 7.63 with no excitement loss — big headroom. Pushing the lift height and first drop.

  38. demolish
    {"demolished":0}
  39. new_ride
    {"dir":2,"ride_type":51,"x":34,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"ride_id":0}
  40. place_pieces
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    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"placed_this_call":99,"total_placed":99}
  41. finish_and_test
    {"bounds":{"max_tile_x":82,"max_tile_y":40,"max_z":504,"min_tile_x":26,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_6… (2883 chars)
  42. best_result
    {"bounds":{"max_tile_x":82,"max_tile_y":40,"max_z":504,"min_tile_x":26,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_6… (2883 chars)

  43. Banked **6.85**. Let me style the winner now, then try one more tweak with the remaining headroom.

  44. style_best_ride
    {"name":"Vespertine","rail_color":"bright_pink","support_color":"dark_purple","track_color":"teal"}
    {"presentation":{"name":"Vespertine","rail_color":"bright_pink","support_color":"dark_purple","track_color":"teal"},"score":6.849999904632568,"score_changed":false,"styled":"best_result"}
  45. demolish
    {"demolished":0}
  46. new_ride
    {"dir":2,"ride_type":51,"x":34,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"ride_id":0}
  47. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_60_to_down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_… (1979 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":40,"z":112},"placed_this_call":99,"total_placed":99}
  48. finish_and_test
    {"bounds":{"max_tile_x":82,"max_tile_y":40,"max_z":504,"min_tile_x":26,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_6… (2884 chars)
  49. best_result
    {"bounds":{"max_tile_x":82,"max_tile_y":40,"max_z":504,"min_tile_x":26,"min_tile_y":30,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","end_station",{"chain":true,"t":"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"},{"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_to_flat"},"flat_to_down_25","down_25_to_down_60","down_60","down_60","down_60","down_60_to_down_25","down_25","down_25_to_flat","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_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_down_25","down_25_to_down_60","down_6… (2998 chars)
  50. Write
    {"content":"---\nname: rct2-coaster-scoring-levers\ndescription: Measured scoring levers for the RCT2 coaster-building contest (MCP \"coaster\" tools) — the intensity-10 cliff and the mid-course brake trick\nmetadata:\n  type: project\n---\n\nIn the RCT2 coaster contest (rounds started 2026-07-27), the reported `score` equals the ride's\n`excitement` after a stock-similarity penalty. Measurements from round 2 (steel twister, ride_type 51):\n\n- **Hard cliff at intensity 10.0.** Same 99-piece layout: I=8.42 → E=6.85; I=10.58 → E=5.14;\n  an early sloppy build at I=14.30 → E=1.97. Excitement is multiplied down in steps once\n  intensity crosses 10, so *target intensity 8–9.5 and never above 10*.\n- **Mid-course brakes are nearly free excitement.** Inserting two `{\"t\":\"brakes\",\"speed\":18}`\n  before the first corkscrew dropped intensity 10.22 → 7.63 with excitement *unchanged* at 6.74.\n  Max lateral G fell 3.03 → 2.38, max positive G 4.83 → 4.09. High-speed corkscrews were the\n  lateral-G source, not the banked turns.\n- **Spend the headroom on lift height.** With intensity bought down, raising the chain lift\n  (18 → 22 `up_25`) and adding a 4th `down_60` took highest_drop 28… (1866 chars)
    File created successfully at: /home/sandbox/.claude/projects/-workspace/memory/rct2-coaster-scoring-levers.md
  51. Write
    {"content":"---\nname: rct2-coaster-circuit-closure\ndescription: Geometry arithmetic for closing an RCT2 coaster circuit on paper before placing pieces\nmetadata:\n  type: project\n---\n\nClosing the loop in the RCT2 coaster contest is pure bookkeeping; doing it on paper first meant\na 92-piece circuit closed on the very first `place_pieces` run with zero rejections.\n\nDirections: 0=-x, 1=+y, 2=+x, 3=-y. Left turn cycles 2→1→0→3→2; right turn is the reverse.\n`piece_geometry` only reports deltas for one facing — rotate them yourself as\n(forward, left) offsets rather than re-querying per turn.\n\nKey facts:\n- **Height parity.** Any flat-to-flat sequence of 25°/60° pieces moves z by a multiple of 16, so\n  every flat run sits at `station_z + 16k`. `half_loop_up` + `half_loop_down` is the exception: it\n  enters flat and exits at down-25, netting **−8** after the levelling `down_25_to_flat`. That breaks\n  parity and makes the station unreachable — pair it with a second half-loop combo, or skip half\n  loops entirely (vertical loops and corkscrew pairs are both dz-neutral and parity-safe).\n- **180° U-turn Δy budget.** From dir 0, two `banked_*_turn_5` give Δ(+1, ±5); turn_5 then … (2069 chars)
    File created successfully at: /home/sandbox/.claude/projects/-workspace/memory/rct2-coaster-circuit-closure.md
  52. Readrejected
    {"file_path":"/home/sandbox/.claude/projects/-workspace/memory/MEMORY.md"}
    File does not exist. Note: your current working directory is /workspace.
  53. Write
    {"content":"- [RCT2 coaster scoring levers](rct2-coaster-scoring-levers.md) — excitement falls off a cliff above intensity 10; mid-course brakes buy that headroom for free.\n- [RCT2 circuit closure geometry](rct2-coaster-circuit-closure.md) — height parity, U-turn Δy budget, and the half-loop trap when planning a closed loop on paper.\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)

  54. **Round 2 result: "Vespertine" — excitement 6.85** (up from 6.56 last round), intensity 8.42, nausea 4.38, 5 inversions, 9 drops, 672 ft, no crash, similarity 0.40. How it got there across five tested builds: | Build | Change | E | I | |---|---|---|---| | v1 | full-speed turnaround after the drop | 1.97 | 14.30 | | v2 | uphill turnaround | 6.47 | 9.73 | | v3 | banked turnaround + more hills | 6.63 | 9.94 | | v4 | 5th inversion | 6.74 | 10.22 | | v5 | brakes(18) before the corkscrews | 6.74 | **7.63** | | **v6** | spent that headroom on lift height | **6.85** | 8.42 | | v7 | brakes(22) — overshot the cliff | 5.14 | 10.58 | The decisive finding was v5: two mid-course brake pieces cut intensity 10.22 → 7.63 with *zero* excitement loss (the high-speed corkscrews, not the banked turns, were making the 3.03 lateral G). That freed budget to raise the chain lift and deepen the first drop, taking highest_drop 28 → 36. v7 confirms the cliff is real and steep — same layout, +4 brake speed, and excitement collapsed by 1.7. I banked a score on the first closed circuit and re-banked after each improvement, so the failed experiments cost nothing. I've saved both findings to memory for rounds 3–6.

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