TRACE · ROUND 1

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

claude-fable-5-1 · 20260902-fable51-design-full · round 1 back to model →
events
31
tool calls
24
rejected
0
session
0:00
Session trace

  1. I'll load the coaster tools, then plan and build a closed-circuit steel twister with a lift, drop, inversion and a return leg.

  2. ToolSearch
    {"max_results":11,"query":"select:mcp__coaster__new_ride,mcp__coaster__place_piece,mcp__coaster__place_pieces,mcp__coaster__valid_next_pieces,mcp__coaster__piece_geometry,mcp__coaster__undo_piece,mcp__coaster__get_state,mcp__coaster__finish_and_test,mcp__coaster__best_result,mcp__coaster__demolish,mcp__coaster__screenshot"}
  3. 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}
  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. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_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_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":34,"y":54,"z":112},"placed_this_call":30,"total_placed":30}
  6. place_pieces
    {"pieces":["flat","flat","left_corkscrew_up"]}
    {"circuit_closed":false,"cursor":{"bank":15,"dir":1,"slope":0,"x":37,"y":56,"z":192},"placed_this_call":3,"total_placed":33}
  7. valid_next_pieces
    {"cursor":{"bank":15,"dir":1,"slope":0,"x":37,"y":56,"z":192},"valid_pieces":["left_corkscrew_down","right_corkscrew_down"]}
  8. place_pieces
    {"pieces":["right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","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","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":26,"total_placed":59}

  9. Circuit closed on the first pass. Running the test now to bank a score.

  10. finish_and_test
    {"bounds":{"max_tile_x":64,"max_tile_y":60,"max_z":344,"min_tile_x":30,"min_tile_y":54,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_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_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","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","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"],"program":null,"rides":[{"average_speed… (1963 chars)

  11. Banked 5.97 excitement. Now I'll fetch geometry for the other facings so I can plan a longer, richer layout.

  12. piece_geometry
    {"dir":2}
    {"deltas":[{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":2,"dx_tiles":1,"dy_tiles":0,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":2,"dx_tiles":1,"d… (7346 chars)
  13. piece_geometry
    {"dir":3}
    {"deltas":[{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"flat","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"end_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"begin_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":0,"piece":"middle_station","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":16,"piece":"up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":64,"piece":"up_60","slope_out":4},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":8,"piece":"flat_to_up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":32,"piece":"up_25_to_up_60","slope_out":4},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":32,"piece":"up_60_to_up_25","slope_out":2},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":8,"piece":"up_25_to_flat","slope_out":0},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":-16,"piece":"down_25","slope_out":6},{"bank_out":0,"dir_out":3,"dx_tiles":0,"dy_tiles":-1,"dz":-64,"piece":"down_60","slope_out":8},{"bank_out":0,"dir_out":3,"dx… (7397 chars)
  14. best_result
    {"bounds":{"max_tile_x":64,"max_tile_y":60,"max_z":344,"min_tile_x":30,"min_tile_y":54,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_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_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","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","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"],"program":null,"rides":[{"average_speed… (1963 chars)
  15. 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}
  16. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","half_loop_up","half_loop_down","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":14,"t":"brakes"},"s_bend_right",{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":15,"dir":0,"slope":0,"x":34,"y":54,"z":272},"placed_this_call":33,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":33,"piece":"half_loop_down"},"total_placed":33}
  17. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":2,"x":34,"y":54,"z":120},"pieces_placed":32,"removed":"half_loop_up"}
  18. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":33,"y":54,"z":112},"pieces_placed":31,"removed":"flat_to_up_25"}
  19. place_pieces
    {"pieces":["flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":14,"t":"brakes"},"flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat","flat","flat","flat",{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":31,"total_placed":62}

  20. Closed again. Testing v2 (taller lift, two vertical loops, corkscrew).

  21. finish_and_test
    {"bounds":{"max_tile_x":64,"max_tile_y":60,"max_z":376,"min_tile_x":29,"min_tile_y":53,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_left_bank","banked_left_turn_5","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":14,"t":"brakes"},"flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat","flat","flat","flat",{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked… (2043 chars)

  22. Intensity is at 8.95, so v3 will swap the high-speed banked turn pair for a large helix to cut lateral G and add a helix bonus. Rebuilding.

  23. 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}
  24. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_left_bank","left_helix_up_large","left_bank_to_flat","flat_to_down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":14,"t":"brakes"},"flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat","flat",{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","banked_left_turn_5","left_bank_to_flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":61,"total_placed":61}
  25. finish_and_test
    {"bounds":{"max_tile_x":64,"max_tile_y":60,"max_z":376,"min_tile_x":29,"min_tile_y":53,"min_z":112},"placed_pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_left_bank","left_helix_up_large","left_bank_to_flat","flat_to_down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat",{"speed":14,"t":"brakes"},"flat_to_up_25","up_25_to_flat","flat_to_down_25","down_25_to_flat","flat","flat",{"speed":12,"t":"brakes"},"flat","flat","flat","flat","flat","flat_to_left_bank","banked_left_turn_3","bank… (2046 chars)
  26. 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}
  27. place_pieces
    {"pieces":["begin_station","middle_station","end_station","flat_to_up_25",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},"up_25_to_flat","flat_to_down_60","down_60","down_60","down_60","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_left_bank","left_helix_up_large","left_bank_to_flat","flat_to_down_25","down_25_to_flat","flat_to_up_25","right_vertical_loop","down_25_to_flat","flat","left_corkscrew_up","right_corkscrew_down","flat_to_right_bank","banked_right_turn_5","right_bank_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat","flat","flat_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_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","flat","flat_to_left_bank","… (1445 chars)
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":60,"z":112},"placed_this_call":81,"total_placed":81}

  28. Closed with the long detour loop. Testing v4.

  29. finish_and_test
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  30. best_result
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  31. Banked score confirmed. Four builds this round, each a closed circuit that tested without crashing: | Build | Excitement | Intensity | Notes | |---|---|---|---| | v1 | 5.97 | 6.39 | 12-piece lift, 1 loop, corkscrew | | v2 | 6.23 | 8.95 | 14-piece lift, 2 loops, corkscrew | | v3 | 6.27 | 9.12 | v2 plus large helix | | v4 | 6.53 | 9.41 | v3 plus long rolling detour loop | The winner is v4. It is an 81-piece steel twister with a 29-unit first drop, two vertical loops, a large helix, a corkscrew, four banked turns and five airtime hills, closing back into the station via a banked approach. Similarity to the stock library is 0.375, so the score stands unpenalized. Intensity sits at 9.41, so there is little headroom left. Any further gains in later rounds should come from length and helices rather than more inversions, and the corkscrew straight after the second loop is the likely source of the 2.85 lateral G. Best coaster: v4 steel twister, excitement 6.53 (intensity 9.41, 3 inversions, no crash).

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