TRACE · ROUND 2

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

claude-fable-5 · 20260803-fable5-design-full · round 2 back to model →
events
55
tool calls
48
rejected
0
session
0:00
Session trace
  1. ToolSearch
    {"max_results":15,"query":"+coaster"}
  2. 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)
  3. ToolSearch
    {"max_results":15,"query":"select:mcp__coaster__new_ride,mcp__coaster__place_piece,mcp__coaster__place_pieces,mcp__coaster__valid_next_pieces,mcp__coaster__get_state,mcp__coaster__undo_piece,mcp__coaster__finish_and_test,mcp__coaster__best_result,mcp__coaster__demolish,mcp__coaster__screenshot,mcp__coaster__piece_geometry"}
  4. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  5. 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_to_flat"},"flat_to_down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":2,"x":31,"y":40,"z":120},"placed_this_call":27,"total_placed":27}

  6. All 27 placed; cursor at (31,40) on an up-25 slope. Checking whether the half loop connects from here.

  7. valid_next_pieces
    {"cursor":{"bank":0,"dir":0,"slope":2,"x":31,"y":40,"z":120},"valid_pieces":["up_25","up_25_to_up_60","up_25_to_flat","up_25_to_left_bank","up_25_to_right_bank","left_turn_5_up_25","right_turn_5_up_25","left_vertical_loop","right_vertical_loop","left_turn_3_up_25","right_turn_3_up_25","half_loop_up"]}

  8. half_loop_up is valid. Placing the half-loop pair, then the vertical loop and corkscrew turnaround.

  9. place_pieces
    {"pieces":["half_loop_up","half_loop_down","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat","left_corkscrew_up","left_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":15,"dir":2,"slope":0,"x":31,"y":40,"z":272},"placed_this_call":1,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":1,"piece":"half_loop_down"},"total_placed":28}

  10. The down-half-loop collides with the up-half-loop's structure. Let me see what can follow at the top.

  11. valid_next_pieces
    {"cursor":{"bank":15,"dir":2,"slope":0,"x":31,"y":40,"z":272},"valid_pieces":["left_corkscrew_down","right_corkscrew_down"]}
  12. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":2,"x":31,"y":40,"z":120},"pieces_placed":27,"removed":"half_loop_up"}
  13. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":32,"y":40,"z":112},"pieces_placed":26,"removed":"flat_to_up_25"}
  14. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":33,"y":40,"z":112},"pieces_placed":25,"removed":"booster"}
  15. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":6,"x":34,"y":40,"z":120},"pieces_placed":24,"removed":"down_25_to_flat"}
  16. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":6,"x":35,"y":40,"z":136},"pieces_placed":23,"removed":"down_25"}
  17. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":6,"x":36,"y":40,"z":152},"pieces_placed":22,"removed":"down_25"}
  18. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":6,"x":37,"y":40,"z":168},"pieces_placed":21,"removed":"down_25"}
  19. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":6,"x":38,"y":40,"z":184},"pieces_placed":20,"removed":"down_25"}
  20. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":39,"y":40,"z":216},"pieces_placed":19,"removed":"down_60_to_down_25"}
  21. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":40,"y":40,"z":280},"pieces_placed":18,"removed":"down_60"}
  22. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":41,"y":40,"z":304},"pieces_placed":17,"removed":"flat_to_down_60"}
  23. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":2,"x":42,"y":40,"z":296},"pieces_placed":16,"removed":"up_25_to_flat"}
  24. place_pieces
    {"pieces":[{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_right_bank","banked_right_turn_3","right_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":51,"z":112},"placed_this_call":24,"total_placed":40}
  25. 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_to_flat","s_bend_right","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":24,"t":"booster"},"flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_flat","flat_to_right_bank","right_helix_down_large","right_helix_down_large","right_bank","right_bank","right_bank","right_bank","right_bank","right_bank","right_bank","banked_right_turn_3","right_bank","right_bank","right_bank","right_bank","right_bank","right_bank","right_bank","right_bank","banked_right_turn_3","right_bank_to_flat",{"speed":15,"t":"brakes"},{"speed":9,"t":"brakes"}]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":40,"total_placed":80}

  26. Circuit closed with all 80 pieces on the first pass. Testing now.

  27. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":360,"min_tile_x":28,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_right_bank","banked_right_turn_3","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_to_flat","s_bend_right","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":24,"t":"booster"},"flat_to_up_25","up_2… (2415 chars)
  28. demolish
    {"demolished":0}
  29. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  30. 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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_right_bank","banked_right_turn_3","right_bank_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"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_to_flat","flat_to_up_25","up_25_to_flat",{"speed":24,"t":"booster"},"flat_to_up_25","up_25_to_flat","flat","flat","flat_to_right_bank","right_helix_down_large","ri… (1534 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":81,"total_placed":81}
  31. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":360,"min_tile_x":28,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_right_bank","banked_right_turn_3","right_bank_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25,"t":"booster"},"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_to_flat","flat_to_up_25","up_25_to_flat",{"speed":24,"t":… (2441 chars)
  32. demolish
    {"demolished":0}
  33. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  34. 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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":30,"t":"booster"},"left_corkscrew_up","left_corkscrew_down","flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25… (1788 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":97,"total_placed":97}

  35. All 97 pieces placed, circuit closed. Testing.

  36. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":360,"min_tile_x":22,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":30,"t":"booster"},"left_corkscrew_up","left_corkscrew_down","flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25","down… (2700 chars)
  37. demolish
    {"demolished":0}
  38. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  39. 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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":27,"t":"booster"},"left_corkscrew_up","left_corkscrew_down","flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"speed":25… (1788 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":97,"total_placed":97}
  40. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":360,"min_tile_x":22,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat",{"speed":27,"t":"booster"},"left_corkscrew_up","left_corkscrew_down","flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25","down… (2700 chars)
  41. demolish
    {"demolished":0}
  42. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  43. 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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"},"flat_to_up_25","left_vertical_loop","down_25_to_flat",{"spe… (1794 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":97,"total_placed":97}
  44. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":360,"min_tile_x":22,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat","flat","flat","flat_to_up_25","up_25","up_25_to_flat","flat","flat_to_down_25","down_25"… (2703 chars)
  45. demolish
    {"demolished":0}
  46. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_flat","flat","flat","flat","flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"}… (1868 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":101,"total_placed":101}
  48. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":376,"min_tile_x":20,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_… (2781 chars)
  49. demolish
    {"demolished":0}
  50. new_ride
    {"dir":0,"ride_type":51,"x":58,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"ride_id":0}
  51. 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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_flat","flat","flat","flat","flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":25,"t":"booster"}… (1882 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":58,"y":40,"z":112},"placed_this_call":101,"total_placed":101}
  52. finish_and_test
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":376,"min_tile_x":20,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_… (2794 chars)

  53. **Banked 7.11** — the third loop worked (intensity 8.08, well under 10). Let me confirm the banked best and take a look at the winner.

  54. best_result
    {"bounds":{"max_tile_x":63,"max_tile_y":52,"max_z":376,"min_tile_x":20,"min_tile_y":40,"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_to_flat"},"flat_to_down_60","down_60","down_60","down_60_to_down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":30,"t":"booster"},"flat_to_up_25","half_loop_up","left_corkscrew_down","flat_to_down_25","down_25","down_25","down_25","down_25","down_25_to_flat",{"speed":26,"t":"booster"},"flat_to_left_bank","left_bank","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_3","left_bank_to_flat","flat_to_up_25","up_25_to_flat","flat_to_up_25","up_25_to_… (2794 chars)

  55. Best result confirmed at **7.11 excitement** (similarity 0.30, safely under the 0.5 penalty threshold). I'll stop here rather than risk the remaining budget — the score is banked, and per instructions I'm leaving naming/colours for the final round. **Round summary:** Iterated through 6 builds, banking progressively: 6.53 → 6.70 → (1.63 failed corkscrew experiment, harmless) → 6.95 → 6.96 → **7.11**. Key learnings: corkscrews taken at ~33mph spiked lateral G to 3.6 and intensity to 15, while vertical loops at ~25mph add inversions almost lateral-free; boosters never fire when natural speed exceeds them. **Best coaster:** a 101-piece steel twister — 14-height chain lift into a 240-unit drop, half-loop + corkscrew Immelmann, banked western switchback with airtime bumps and an elevated plateau that vaults over earlier track, three alternating vertical loops (4 inversions total), a 360° descending helix finale, and a banked return run. **Excitement 7.11, intensity 8.08, nausea 4.06** — up from 6.38 last round.

← claude-fable-5 · 20260803-fable5-design-full · all runs