TRACE · ROUND 2

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

openrouter_moonshotai_kimi-k3 · 20260728-kimi-k3-design-rerun · round 2 back to model →
events
49
tool calls
21
rejected
1
session
29:38
cost
$1.27
Session trace
  1. 1:31
    get_state9 msrejected
  2. 1:32
    piece_geometry14 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)
  3. 1:33
    piece_geometry16 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. 1:34
    piece_geometry14 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)
  5. 1:35
    piece_geometry14 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)
  6. 1:35

    I'll start by reviewing the piece geometry so I can plan a closed circuit precisely, and check the current state.

  7. 1:35
    $0.0549
  8. 17:35
    new_ride36 ms
    {"dir":0,"ride_type":51,"x":60,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":40,"z":112},"ride_id":0}
  9. 17:37

    I have full geometry now. My plan (learned from round 1: keep 2+ vertical loops, add a corkscrew, taller lift for a bigger drop, longer return leg): **Layout** (start (60,40) facing -x, all clear of the lake): - 4 station pieces → chain lift: 14× up_25 (top z=352) → 60° triple drop back to ground - Vertical loop #1 → small airtime hop → corkscrew (turnaround, reverses to +x) - Vertical loop #2 → airtime hill → s-bends → long return straight → brakes → two left_turn_3 U-turn landing exactly back at (60,40) Closure math verified: the final `left_turn_3`+`left_turn_3` pair gives net (dx=-1, dy=+3, dir 2→0), landing cursor precisely on the start tile facing dir 0.

  10. 17:37
    $0.2215
  11. 17:57
    place_pieces36 ms
    {"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","down_60_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":8,"x":37,"y":40,"z":120},"placed_this_call":23,"rejection":{"error":"Raise or lower land first","index":23,"piece":"down_60_to_flat"},"total_placed":23}
  12. 17:57

    Ride created at (60,40) facing -x. Building the station, lift hill, and big drop:

  13. 17:57
    $0.1048
  14. 23:59
    valid_next_pieces19 ms
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":37,"y":40,"z":120},"valid_pieces":[]}
  15. 24:08

    The third `down_60` was rejected — terrain collision. The lift height vs drop depth mismatched my paper math, so let me check what's actually valid at this cursor:

  16. 24:08
    $0.0623
  17. 24:15
    undo_piece26 ms
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":38,"y":40,"z":184},"pieces_placed":22,"removed":"down_60"}
  18. 24:15

    Nothing is valid here — I'm trapped on a steep slope near terrain. Undoing back to the lift top to reassess the real heights:

  19. 24:15
    $0.1142
  20. 24:21
    undo_piece20 ms
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":39,"y":40,"z":248},"pieces_placed":21,"removed":"down_60"}
  21. 24:21
    $0.0171
  22. 24:23
    undo_piece25 ms
    {"cursor":{"bank":0,"dir":0,"slope":8,"x":40,"y":40,"z":312},"pieces_placed":20,"removed":"down_60"}
  23. 24:23
    $0.0149
  24. 24:58

    The undo behavior doesn't match my model — let me inspect the actual recorded piece list:

  25. 24:58
    get_state19 ms
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":8,"x":40,"y":40,"z":312},"finalized":false,"pieces_placed":20,"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"],"ride_id":0,"start":{"bank":0,"dir":0,"slope":0,"x":60,"y":40,"z":112},"total_cost":17928}
  26. 24:58
    $0.0409
  27. 26:23

    Now I understand exactly what happened: I actually submitted 13 `up_25` (lift top z=336), and the drop needs to shed exactly 224 z to reach ground. The math now checks out. Continuing the drop with a gentler exit, then loop 1, hop, and the corkscrew turnaround:

  28. 26:23
    place_pieces22 ms
    {"pieces":["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_to_flat","flat_to_down_25","down_25_to_flat","left_corkscrew_up","left_corkscrew_down"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":27,"y":36,"z":112},"placed_this_call":15,"total_placed":35}
  29. 26:23
    $0.1680
  30. 26:36
    place_pieces20 ms
    {"pieces":["flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","s_bend_left","s_bend_right","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"left_turn_3","left_turn_3"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":40,"z":112},"placed_this_call":31,"total_placed":66}
  31. 26:36
    $0.0314
  32. 26:54

    Circuit closed exactly on the start tile. Testing now to bank a score:

  33. 26:54
    finish_and_test664 ms
    {"bounds":{"max_tile_x":62,"max_tile_y":40,"max_z":360,"min_tile_x":25,"min_tile_y":36,"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","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","left_corkscrew_up","left_corkscrew_down","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat","s_bend_left","s_bend_right","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"l… (2030 chars)
  34. 26:54
    $0.0275
  35. 28:44
    demolish18 ms
    {"demolished":0}
  36. 28:46

    Banked **6.30 excitement** (intensity 9.01 — a bit close to the 10 danger zone, driven by the corkscrew's 2.87 lateral G). Score is safe in best_result. Now I'll try to beat it: v2 swaps the corkscrew for a milder banked 180° turnaround (cuts lateral G), adds a **third vertical loop**, a taller/steeper 240-z drop, and more airtime hops + length:

  37. 28:46
    $0.1112
  38. 28:56
    new_ride16 ms
    {"dir":0,"ride_type":51,"x":60,"y":40}
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":40,"z":112},"ride_id":0}
  39. 28:56
    $0.1524
  40. 29:12
    place_pieces33 ms
    {"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","down_60_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":31,"y":39,"z":112},"placed_this_call":28,"total_placed":28}
  41. 29:12
    $0.0495
  42. 29:28

    Lift, drop, and loop 1 placed perfectly. Now the airtime hop, banked 180° turnaround, loop 2, and hop B:

  43. 29:28
    place_pieces22 ms
    {"pieces":["flat_to_up_25","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","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","left_vertical_loop","down_25_to_flat","flat_to_up_25","up_25","up_25_to_flat","flat_to_down_25","down_25","down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":36,"y":33,"z":112},"placed_this_call":21,"total_placed":49}
  44. 29:28
    $0.0385
  45. 29:36
    place_pieces21 ms
    {"pieces":["flat_to_up_25","left_vertical_loop","down_25_to_flat","s_bend_left","s_bend_left","s_bend_left","flat","flat","flat","flat","flat","flat","flat","flat","flat","flat",{"speed":12,"t":"brakes"},{"speed":12,"t":"brakes"},"left_turn_3","left_turn_3"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":0,"slope":0,"x":60,"y":40,"z":112},"placed_this_call":20,"total_placed":69}
  46. 29:36

    Return leg is on track. Final chunk — loop 3, s-bend jog, straight, brakes, and the closing U-turn:

  47. 29:36
    $0.0404
  48. 29:38
    finish_and_test645 ms
    {"bounds":{"max_tile_x":62,"max_tile_y":40,"max_z":376,"min_tile_x":22,"min_tile_y":32,"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","down_60_to_flat","flat_to_up_25","left_vertical_loop","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_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_left_bank","banked_left_turn_5","left_bank_to_flat","flat_to_up_25","left_vertical_loop","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_to_up_25","left_vertical_loop","down_25_to_flat","s_bend_left","s_bend_left","s_bend_left","fla… (2147 chars)
  49. 29:38
    $0.0176

← openrouter_moonshotai_kimi-k3 · 20260728-kimi-k3-design-rerun · all runs