TRACE · ROUND 1

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 1 back to model →
events
45
tool calls
17
rejected
0
session
28:30
Session trace
  1. 0:03
    piece_geometry9 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

    I'll start by understanding the piece catalog and geometry to plan a closed circuit.

  3. 0:03
    piece_geometry9 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)
  4. 0:03
  5. 1:49
    piece_geometry19 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. 1:49
    piece_geometry8 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. 1:49

    Let me get the full geometry for all directions so I can plan a closed circuit precisely.

  8. 1:49
  9. 5:13
    new_ride13 ms
    {"dir":0,"ride_type":51,"x":40,"y":80}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":40,"y":80,"z":112},"ride_id":0}
  10. 5:13

    I have the full geometry. Let me plan a simple closed rectangle circuit and bank a score early, then iterate. I'll build west of the lake at (40,80) facing dir 0 (-x).

  11. 5:13
  12. 7:21
    place_pieces25 ms
    {"pieces":["begin_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_to_flat"}]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":29,"y":80,"z":224},"placed_this_call":11,"total_placed":11}
  13. 7:21

    Now I'll build a simple closed circuit quickly to bank a score. Starting at (40,100), facing -x (dir 0), with 3 station pieces, then a lift, drop, one vertical loop, boosters, and a return leg.

  14. 7:21
  15. 8:43
    place_pieces8 ms
    {"pieces":["flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","right_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":21,"y":80,"z":112},"placed_this_call":8,"rejection":{"error":"ride type 51 has no artwork for this piece: it would build and rate but render as nothing (invisible track). valid_next_pieces lists what this ride can draw here","index":8,"piece":"right_turn_1"},"total_placed":19}
  16. 8:43

    At the top of the lift (29,80, z224). Now I'll build a big drop and a rectangular return loop that ends back at (40,80) dir0. Placing the drop first.

  17. 8:43
  18. 8:51

    The tight turn isn't in this ride's artwork set. Let me check what's available.

  19. 8:51
    valid_next_pieces10 ms
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":21,"y":80,"z":112},"valid_pieces":["flat","end_station","begin_station","middle_station","flat_to_up_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"]}
  20. 8:51
  21. 9:21
    get_state15 ms
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":21,"y":80,"z":112},"finalized":false,"pieces_placed":19,"placed_pieces":["begin_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_to_flat"},"flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat"],"ride_id":0,"start":{"bank":0,"dir":0,"slope":0,"x":40,"y":80,"z":112},"total_cost":15222}
  22. 9:21

    The tight turns aren't in this ride's artwork set. Let me check my state and plan the return with turn_5/turn_3 pieces.

  23. 9:21
    piece_geometry16 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)
  24. 9:21
  25. 11:20
    place_pieces16 ms
    {"pieces":["right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":49,"y":80,"z":112},"placed_this_call":58,"total_placed":77}
  26. 11:20

    Good — the ride lacks artwork for tight turns/loops/helices, but turn_3, turn_5, s-bends, and corkscrews are available. I'll route the return leg using right_turn_3 pieces, landing exactly on the start tile (40,80). Placing the return circuit with boosters to keep momentum.

  27. 11:20
  28. 11:35

    Place the final flats to close the circuit at (40,80).

  29. 11:35
    place_pieces14 ms
    {"pieces":["flat","flat","flat","flat","flat","flat","flat","flat","flat"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":40,"y":80,"z":112},"placed_this_call":9,"total_placed":86}
  30. 11:35
  31. 11:40

    Circuit closed at 86 pieces. Let me test it now to bank a score early.

  32. 11:41
    finish_and_test710 ms
    {"bounds":{"max_tile_x":51,"max_tile_y":96,"max_z":248,"min_tile_x":20,"min_tile_y":80,"min_z":112},"placed_pieces":["begin_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_to_flat"},"flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","right_turn_3","flat","flat","flat","flat","flat","flat","flat","flat","flat"],"program":null,"rides":[{"average_speed":538423,"circuit":{"looped":true,"orphan_pieces":0,"total_pieces":86,"walked_pieces":86},"crashed":false,"excitement":1.3799999952316284,"highest_drop":14,"id":0,"int… (1803 chars)
  33. 11:41
  34. 18:47
    demolish20 ms
    {"demolished":0}
  35. 18:47

    The score is low (excitement 1.38) and it's flagged as similar to a stock design. Let me demolish and rebuild a taller, longer, more original circuit with a 60-degree drop.

  36. 18:47
  37. 24:40
    new_ride14 ms
    {"dir":0,"ride_type":51,"x":45,"y":80}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":45,"y":80,"z":112},"ride_id":0}
  38. 24:41

    Score too low and too similar to stock. Demolished. Let me rebuild a taller, faster, more original circuit with a big drop and a corkscrew. I'll plan it precisely: start (45,80) dir0, 3 station pieces, chain lift, turn north, big drop, long run, corkscrew turnaround, and return to close at (45,80).

  39. 24:41
  40. 28:09

    Now I'll build a taller, faster circuit with a big drop, boosters, and brakes. Start (60,80) facing -x, 3 station pieces, then a taller chain lift.

  41. 28:09
    place_pieces16 ms
    {"pieces":["begin_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_to_flat"},"flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":20,"y":80,"z":112},"placed_this_call":25,"total_placed":25}
  42. 28:09
  43. 28:30

    Let me verify my cursor position.

  44. 28:30
    get_state15 ms
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":20,"y":80,"z":112},"finalized":false,"pieces_placed":25,"placed_pieces":["begin_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_to_flat"},"flat_to_down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25","down_25_to_flat"],"ride_id":0,"start":{"bank":0,"dir":0,"slope":0,"x":45,"y":80,"z":112},"total_cost":20808}
  45. 28:30

← openrouter_deepseek_deepseek-v4-flash-0731 · 20260731-deepseek-v4-flash-design · all runs