TRACE · ROUND 2

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

claude-opus-5 · 20260724-opus5-twister · round 2 back to model →
events
50
tool calls
41
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 piece_geometry finish_and_test"}
  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. Plan: tall lift, 36ft drop, then half-loop→corkscrew, banked turns, vertical loop, airtime hills, corkscrew pair, and a small helix closing into brakes. Let me build.

  5. 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}
  6. place_pieces
    {"pieces":["begin_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"}]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":33,"y":60,"z":464},"placed_this_call":27,"total_placed":27}
  7. place_pieces
    {"pieces":["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","half_loop_up","right_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":25,"y":58,"z":256},"placed_this_call":11,"total_placed":38}
  8. place_pieces
    {"pieces":["flat_to_left_bank","banked_left_turn_5","left_bank_to_down_25","down_25","down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":36,"y":54,"z":208},"placed_this_call":9,"total_placed":47}
  9. 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"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":45,"y":57,"z":208},"placed_this_call":8,"total_placed":55}
  10. 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","up_25_to_flat","flat_to_down_25","down_25","down_25","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","flat","flat","flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":66,"y":57,"z":128},"placed_this_call":21,"total_placed":76}
  11. place_pieces
    {"pieces":["left_helix_down_small","left_bank_to_flat","brakes","brakes","brakes","brakes"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":66,"y":57,"z":128},"placed_this_call":0,"rejection":{"error":"piece enters left-banked but the track here is unbanked; add a banking transition piece first","index":0,"piece":"left_helix_down_small"},"total_placed":76}
  12. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":65,"y":57,"z":128},"pieces_placed":75,"removed":"flat"}
  13. place_pieces
    {"pieces":["flat_to_left_bank","left_helix_down_small","left_bank_to_flat","brakes","brakes","brakes","brakes"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":7,"total_placed":82}

  14. Circuit closed. Testing to bank a score.

  15. finish_and_test
    {"bounds":{"max_tile_x":67,"max_tile_y":60,"max_z":488,"min_tile_x":22,"min_tile_y":54,"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_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","half_loop_up","right_corkscrew_down","flat_to_left_bank","banked_left_turn_5","left_bank_to_down_25","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_to_flat","flat_to_dow… (2318 chars)

  16. Banked 6.44. Now let me build a longer version with more drops, more airtime, and gentler G-forces.

  17. demolish
    {"demolished":0}
  18. 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}
  19. place_pieces
    {"pieces":["begin_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"},{"chain":true,"piece":"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"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":24,"y":60,"z":192},"placed_this_call":36,"total_placed":36}
  20. place_pieces
    {"pieces":["flat_to_up_25","half_loop_up","right_corkscrew_down","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_left_bank","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":28,"y":47,"z":224},"placed_this_call":14,"total_placed":50}
  21. place_pieces
    {"pieces":["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_to_flat","flat_to_down_25","down_25","down_25_to_flat","right_corkscrew_up","left_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":45,"y":43,"z":192},"placed_this_call":15,"total_placed":65}
  22. 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","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_left_bank","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":63,"y":47,"z":144},"placed_this_call":18,"total_placed":83}
  23. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_down_25","down_25_to_flat","brakes","brakes","brakes","brakes","flat_to_left_bank","banked_left_turn_3","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":14,"total_placed":97}
  24. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":60,"max_z":504,"min_tile_x":21,"min_tile_y":43,"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","half_loop_up","right_corkscrew_down","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_left_bank","banked_left_turn_5","left_bank_to_flat… (2617 chars)

  25. Key insight: v3's raw excitement was higher (~8) but intensity 14.5 triggered a big penalty. I need intensity under 10. Building v4 with an L-shaped lift (more room), softer pullout, slower turns.

  26. demolish
    {"demolished":0}
  27. 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}
  28. place_pieces
    {"pieces":["begin_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":"left_turn_5_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"}]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":41,"y":53,"z":432},"placed_this_call":22,"total_placed":22}

  29. L-shaped chain lift worked. Now the drop and vertical loop.

  30. place_pieces
    {"pieces":["flat_to_down_25","down_25","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":46,"y":34,"z":224},"placed_this_call":18,"total_placed":40}
  31. place_pieces
    {"pieces":["flat_to_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","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":66,"y":32,"z":208},"placed_this_call":18,"total_placed":58}
  32. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25","down_25","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","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat_to_down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":66,"y":51,"z":112},"placed_this_call":19,"total_placed":77}
  33. place_pieces
    {"pieces":["flat","flat","flat","brakes","brakes","brakes","brakes","flat_to_left_bank","banked_left_turn_3","left_bank_to_flat","brakes","brakes","brakes"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":13,"total_placed":90}
  34. finish_and_test
    {"bounds":{"max_tile_x":66,"max_tile_y":60,"max_z":456,"min_tile_x":41,"min_tile_y":28,"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":"left_turn_5_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","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_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","down_25_to_flat","right_corkscrew_up","left_co… (2413 chars)

  35. Banked 6.59 (intensity 9.15, headroom left). Building v5: adds a 4th inversion, fewer brakes, one more drop.

  36. demolish
    {"demolished":0}
  37. 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}
  38. place_pieces
    {"pieces":["begin_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":"left_turn_5_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"flat_to_down_25","down_25","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":46,"y":34,"z":224},"placed_this_call":40,"total_placed":40}
  39. place_pieces
    {"pieces":["flat_to_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","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","up_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":1,"slope":0,"x":63,"y":41,"z":176},"placed_this_call":26,"total_placed":66}
  40. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","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_down_25","down_25_to_flat","brakes","brakes","brakes","brakes","flat_to_left_bank","banked_left_turn_3","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":20,"total_placed":86}
  41. finish_and_test
    {"bounds":{"max_tile_x":66,"max_tile_y":60,"max_z":456,"min_tile_x":41,"min_tile_y":28,"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":"left_turn_5_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","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_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","down_25_to_flat","right_corkscrew_up","left_co… (2405 chars)

  42. 6.65 banked. Quick final tweak: swap two brakes for plain track to lift average speed.

  43. place_piecesrejected
    {"pieces":["flat"]}
    ride already finalized; use demolish + new_ride to rebuild
  44. demolish
    {"demolished":0}
  45. 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}
  46. place_pieces
    {"pieces":["begin_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":"left_turn_5_up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25"},{"chain":true,"piece":"up_25_to_flat"},"flat_to_down_25","down_25","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_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","down_25_to_flat","right_corkscrew_up","left_corkscrew_down","flat_to_up_25","up_… (1390 chars)
    {"circuit_closed":false,"cursor":{"bank":0,"dir":1,"slope":0,"x":63,"y":41,"z":176},"placed_this_call":66,"total_placed":66}
  47. place_pieces
    {"pieces":["flat_to_up_25","up_25_to_flat","flat_to_down_25","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_down_25","down_25_to_flat","flat","flat","brakes","brakes","flat_to_left_bank","banked_left_turn_3","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":20,"total_placed":86}
  48. finish_and_test
    {"bounds":{"max_tile_x":66,"max_tile_y":60,"max_z":456,"min_tile_x":41,"min_tile_y":28,"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":"left_turn_5_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","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_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","down_25_to_flat","right_corkscrew_up","left_co… (2403 chars)
  49. best_result
    {"bounds":{"max_tile_x":66,"max_tile_y":60,"max_z":456,"min_tile_x":41,"min_tile_y":28,"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":"left_turn_5_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","down_25_to_down_60","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","up_25","up_25_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_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","down_25_to_flat","right_corkscrew_up","left_co… (2405 chars)

  50. Round 2 done. Four builds, four tested circuits (6.44 → 2.03 → 6.59 → **6.65**). Key finding this round: intensity ≥10 triggers a hard excitement penalty. Build #2 had the *highest* raw excitement (~8.1) but intensity 14.47 slashed it to 2.03. Everything after that was intensity management: an L-shaped chain lift (freed map room so turns could be placed at hill crests where the train is slow), a softer 60° pullout, and banked-only turns dropped max lateral G from 3.24→2.86 and positive G from 5.55→4.78, landing intensity at 9.52 — just under the cliff. **Best: 86-piece steel twister — L-shaped 40 ft chain lift, 32 ft plunge into a vertical loop, then a serpentine of airtime hops threaded with three corkscrew pairs across two lanes; excitement 6.65, intensity 9.52, nausea 5.77, 4 inversions, 10 drops, 74 air time, similarity 0.40.**

← claude-opus-5 · 20260724-opus5-twister · all runs