TRACE · ROUND 4

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

claude-opus-5 · 20260725-opus5-blind · round 4 back to model →
events
49
tool calls
42
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_piece finish_and_test"}
  3. Readrejected
    {"file_path":"/home/sandbox/.claude/projects/-workspace/memory/MEMORY.md"}
    File does not exist. Note: your current working directory is /workspace.
  4. 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)
  5. 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)
  6. 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)

  7. Geometry mapped. Let me build: station + tall chain lift + big drop + loop.

  8. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":44}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"ride_id":0}
  9. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":38,"y":49,"z":384},"placed_this_call":25,"total_placed":25}
  10. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","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":51,"y":50,"z":176},"placed_this_call":12,"total_placed":37}
  11. place_pieces
    {"pieces":["flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":56,"y":55,"z":176},"placed_this_call":10,"total_placed":47}
  12. place_pieces
    {"pieces":["left_corkscrew_up","right_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":53,"y":52,"z":176},"placed_this_call":2,"total_placed":49}
  13. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25_to_flat",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":39,"y":57,"z":320},"placed_this_call":17,"total_placed":66}
  14. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25_to_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","right_corkscrew_up","left_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":53,"y":55,"z":144},"placed_this_call":12,"total_placed":78}
  15. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25_to_flat","brakes","brakes","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","brakes","brakes","flat","flat","flat","right_turn_5","flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"placed_this_call":18,"total_placed":96}
  16. finish_and_test
    {"bounds":{"max_tile_x":64,"max_tile_y":58,"max_z":408,"min_tile_x":35,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_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_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","left_corkscrew_up","right_corkscrew_down","flat_to_down_25","down_25","down_25_to_flat",{"chain":true,"t":"flat_to_up_… (2649 chars)

  17. Banked 6.86 (intensity only 7.09 — lots of headroom). Rebuilding bigger: taller lifts, 6 inversions, more airtime.

  18. demolish
    {"demolished":0}
  19. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":44}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"ride_id":0}
  20. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","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":51,"y":50,"z":176},"placed_this_call":41,"total_placed":41}
  21. place_pieces
    {"pieces":["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_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":43,"y":63,"z":352},"placed_this_call":31,"total_placed":72}
  22. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_down_25","down_25","down_25_to_flat","flat_to_right_bank","banked_right_turn_3","right_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":64,"y":58,"z":112},"placed_this_call":20,"total_placed":92}
  23. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","brakes","brakes","flat","flat","right_turn_5","flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"placed_this_call":14,"total_placed":106}
  24. finish_and_test
    {"bounds":{"max_tile_x":64,"max_tile_y":64,"max_z":440,"min_tile_x":33,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_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","left_corkscrew_up","right_corkscrew_down","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","f… (2880 chars)

  25. Intensity spiked but excitement didn't. Corkscrew pairs only count as 1 inversion — so v3: more vertical loops + more airtime hills, wide banked turns only.

  26. demolish
    {"demolished":0}
  27. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":44}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"ride_id":0}
  28. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","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":48,"y":50,"z":224},"placed_this_call":40,"total_placed":40}
  29. place_pieces
    {"pieces":["flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","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"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":38,"y":50,"z":160},"placed_this_call":26,"total_placed":66}
  30. place_pieces
    {"pieces":["flat_to_right_bank","banked_right_turn_5","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":58,"y":56,"z":112},"placed_this_call":22,"total_placed":88}
  31. place_pieces
    {"pieces":["brakes","brakes","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat","flat","brakes","brakes","flat","flat","right_turn_5"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"placed_this_call":12,"total_placed":100}
  32. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":56,"max_z":456,"min_tile_x":32,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","l… (2610 chars)

  33. Excitement plateaus ~6.9. Trying a final design: 4 loops + 2 corkscrew pairs (6 inversions), turnarounds banked and slowed by climbs.

  34. demolish
    {"demolished":0}
  35. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":44}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"ride_id":0}
  36. place_pieces
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    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":45,"y":50,"z":224},"placed_this_call":41,"total_placed":41}
  37. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_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_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","s_bend_right","s_bend_right"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":55,"y":56,"z":224},"placed_this_call":22,"total_placed":63}
  38. place_pieces
    {"pieces":["flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_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_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_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","s_bend_right"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":35,"y":47,"z":224},"placed_this_call":26,"total_placed":89}
  39. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","left_corkscrew_up","right_corkscrew_down","s_bend_right","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","brakes","brakes","brakes","brakes","right_turn_5","right_turn_5"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"placed_this_call":25,"total_placed":114}
  40. finish_and_test
    {"bounds":{"max_tile_x":65,"max_tile_y":56,"max_z":488,"min_tile_x":28,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","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_up_25","up_25_to_flat","flat_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_to_fl… (2895 chars)

  41. Intensity 15.3 halved the score, but raw stats were much better (airtime 82, 14 drops, 6 inversions, length 874). One fast retune to get intensity under 10:

  42. demolish
    {"demolished":0}
  43. new_ride
    {"dir":0,"ride_type":51,"x":60,"y":44}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"ride_id":0}
  44. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station",{"chain":true,"piece":"flat_to_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_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_to_flat","flat_to_d… (2195 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":44,"z":112},"placed_this_call":114,"total_placed":114}
  45. finish_and_test
    {"bounds":{"max_tile_x":65,"max_tile_y":56,"max_z":488,"min_tile_x":28,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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_to_flat"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25_to_flat","flat_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_to_fl… (2887 chars)
  46. best_result
    {"bounds":{"max_tile_x":63,"max_tile_y":56,"max_z":456,"min_tile_x":32,"min_tile_y":44,"min_z":112},"placed_pieces":["begin_station","middle_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"},"right_turn_5","right_turn_5","flat_to_down_25","down_25","down_25_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","l… (2610 chars)
  47. Write
    {"content":"---\nname: rct2-coaster-contest-tuning\ndescription: Hard-won tuning facts for the RCT2 steel-twister (ride_type 51) coaster-design contest via the coaster MCP tools\nmetadata:\n  type: project\n---\n\nRound-by-round results in the coaster MCP contest (steel twister, ride_type 51): scores plateau at\nexcitement 6.8-7.0 for lift-hill + loops + airtime layouts. Round 3: 6.99 (int 9.94). Round 4 best: 6.93\n(int 9.96, 5 inversions, 744 length, 57 airtime, 100 pieces).\n\nFacts established by experiment (2026-07-25, round 4):\n- **Intensity >= 10 halves excitement, repeatedly.** A build with strictly better raw stats\n  (airtime 82, 14 drops, 6 inversions, length 874) scored 1.66 because intensity hit 15.3.\n  Staying just under 10.0 is the single most important constraint.\n- Adding elements (loops, hops, length) raises intensity much faster than excitement; going from\n  int 7.09 -> 9.96 moved excitement only 6.86 -> 6.93.\n- Lowering the lift 48z and softening the first drop (one down_60 instead of two) did NOT cut\n  intensity meaningfully (15.7 vs 15.3) — element/turn COUNT drives it, not just peak G.\n- **A corkscrew_up + corkscrew_down pair counts as only 1 inversion… (2221 chars)
    File created successfully at: /home/sandbox/.claude/projects/-workspace/memory/rct2-coaster-contest-tuning.md
  48. Write
    {"content":"- [RCT2 coaster contest tuning](rct2-coaster-contest-tuning.md) — intensity >=10 halves excitement; corkscrew pairs count as 1 inversion; cursor-delta rotation rule for planning closure.\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)

  49. Round 4 done — four builds tested, best banked. **Results this round:** | build | excitement | intensity | notes | |---|---|---|---| | v1 (2 chain lifts, 4 inv) | 6.86 | 7.09 | banked early, lots of headroom | | v2 (taller, tighter turns) | 6.81 | 9.73 | speed up, excitement flat | | **v3 (4 loops + corkscrew pair, 100 pcs)** | **6.93** | **9.96** | ← best_result | | v4/v5 (6 inv, 874 length, 82 airtime) | 1.63–1.66 | 15.3–15.7 | intensity ≥10 halved excitement repeatedly | Key finding: the scoring cliff at intensity 10 is brutal — my most spectacular ride (14 drops, 6 inversions, 82 airtime, 874 length) scored 1.66 purely because intensity hit 15.3. Also confirmed a corkscrew up+down pair counts as only **1** inversion, while each vertical loop counts as 1. Saved both learnings to memory for rounds 5–6. **Best coaster: a 100-piece original twister — 352-unit chain lift, 26-step first drop, 4 vertical loops, a double corkscrew, three airtime camelbacks and wide banked turnarounds — excitement 6.93 (intensity 9.96, nausea 6.11, 5 inversions, similarity 0.37).**

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