TRACE · ROUND 4

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

openrouter_deepseek_deepseek-v4-flash-0731 · 20260731-deepseek-v4-flash-design · round 4 back to model →
events
29
tool calls
13
rejected
1
session
18:29
cost
$0.07
Session trace
  1. 0:03
    piece_geometry10 ms
    {"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)
  2. 0:03
    get_state12 msrejected
  3. 0:03
    $0.0010
  4. 0:54
    piece_geometry11 ms
    {"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)
  5. 0:55
    piece_geometry11 ms
    {"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. 0:55
    piece_geometry12 ms
    {"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)
  7. 0:55
    $0.0021
  8. 6:19
    new_ride15 ms
    {"dir":2,"ride_type":51,"x":30,"y":90}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":30,"y":90,"z":112},"ride_id":0}
  9. 6:19

    I have all the geometry. Let me plan a closed circuit with two vertical loops (original layout), then build. Starting at (30,90) facing +x, away from the lake.

  10. 6:19
    $0.0078
  11. 11:04

    The previous attempt never even started a ride, so I'll build from scratch. I've planned a closed rectangular circuit on paper with two vertical loops, a lift/drop, and airtime hills, ending back at the station tile facing +x. Starting to build.

  12. 11:04
    place_pieces28 ms
    {"pieces":["begin_station","middle_station","end_station",{"chain":true,"t":"up_25"},{"chain":true,"t":"up_25"},{"chain":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","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","half_loop_up","half_loop_down","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":33,"y":90,"z":112},"placed_this_call":3,"rejection":{"error":"piece enters at 25-up slope but the track here is flat; add a slope transition piece first","index":3,"piece":"up_25"},"total_placed":3}
  13. 11:04
    $0.0092
  14. 11:12

    Need a slope transition first. Fixing:

  15. 11:12
    place_pieces57 ms
    {"pieces":["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"},"up_25_to_flat","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","half_loop_up","half_loop_down","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":42,"y":90,"z":240},"placed_this_call":9,"rejection":{"error":"piece enters at 25-down slope but the track here is flat; add a slope transition piece first","index":9,"piece":"down_25"},"total_placed":12}
  16. 11:12
    $0.0074
  17. 11:24

    Need a transition into the descent too. Let me check state and continue correctly:

  18. 11:24
    get_state20 ms
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":42,"y":90,"z":240},"finalized":false,"pieces_placed":12,"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"},"up_25_to_flat"],"ride_id":0,"start":{"bank":0,"dir":2,"slope":0,"x":30,"y":90,"z":112},"total_cost":9867}
  19. 11:24
    $0.0074
  20. 13:14

    Good, lift is built (z~240 at crest). Now the big drop and the inversions section. Continuing:

  21. 13:14
    place_pieces19 ms
    {"pieces":["flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","half_loop_up","half_loop_down","down_25_to_flat","right_turn_1","flat","flat","half_loop_up","half_loop_down","down_25_to_flat","right_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":50,"y":90,"z":128},"placed_this_call":8,"rejection":{"error":"piece enters at 25-up slope but the track here is flat; add a slope transition piece first","index":8,"piece":"half_loop_up"},"total_placed":20}
  22. 13:14
    $0.0090
  23. 13:29
    valid_next_pieces19 ms
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":50,"y":90,"z":128},"valid_pieces":["flat","end_station","begin_station","middle_station","flat_to_up_25","flat_to_down_25","left_turn_5","right_turn_5","flat_to_left_bank","flat_to_right_bank","s_bend_left","s_bend_right","left_turn_3","right_turn_3","left_corkscrew_up","right_corkscrew_up","flat_to_up_60","brakes","booster"]}
  24. 13:29
    $0.0083
  25. 18:22
    place_piece15 ms
    {"piece":"right_corkscrew_up"}
    {"circuit_closed":false,"cost":2275,"cursor":{"bank":15,"dir":3,"slope":0,"x":51,"y":88,"z":208},"pieces_placed":21,"placed":"right_corkscrew_up"}
  26. 18:22

    The game accepts corkscrew inversions at this flat cursor. Let me experiment with the corkscrew element and observe the resulting states:

  27. 18:22
    $0.0047
  28. 18:29
    valid_next_pieces11 ms
    {"cursor":{"bank":15,"dir":3,"slope":0,"x":51,"y":88,"z":208},"valid_pieces":["left_corkscrew_down","right_corkscrew_down"]}
  29. 18:29
    $0.0106

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