TRACE · ROUND 1

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

openrouter_moonshotai_kimi-k3 · 20260725-codex-kimi · round 1 back to model →
events
77
tool calls
50
rejected
0
session
0:00
Session trace

  1. Model metadata for `moonshotai/kimi-k3` not found. Defaulting to fallback metadata; this can degrade performance and cause issues.

  2. I'll start by checking piece geometry to plan a closed circuit.

  3. new_ride
    {"dir":2,"ride_type":51,"x":40,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112},"ride_id":0}
  4. 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)

  5. I'll query geometry for other facings so I can plan the return leg.

  6. 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)
  7. piece_geometry
    {"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)
  8. 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)

  9. Now I have all the geometry I need. Let me plan a layout offline with Python before placing.

  10. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan.py
# Plan a steel twister coaster layout for RCT2 ride_type 51
# Start at (40,40) facing +x (dir 2)
# Lake at tiles (68-85, 55-75) - avoid
# Want: station, chain lift, drop, loop, corkscrews, helix, closed circuit back

# Directions: 0=-x, 1=+y, 2=+x, 3=-y
# Tile deltas per facing for key pieces (from piece_geometry):

# dir 2 (+x):
#   flat: (1,0), begin/middle/end_station: (1,0)
#   up_25: (1,0) dz+16, down_25: (1,0) dz-16
#   flat_to_up_25: (1,0) dz+8, up_25_to_flat: (1,0) dz+8
#   flat_to_down_25: (1,0) dz-8, down_25_to_flat: (1,0) dz-8
#   left_turn_5: (2,3) -> dir 1
#   right_turn_5: (2,-3) -> dir 3
#   left_turn_3: (1,2) -> dir 1
#   right_turn_3: (1,-2) -> dir 3
#   left_turn_1: (0,1) -> dir 1
#   right_turn_1: (0,-1) -> dir 3
#   half_loop_up: (0,0) dz+152 -> dir 0, bank 15
#   half_loop_down: (0,0) dz-152 -> dir 0 (from dir 0 input)
#   left_corkscrew_up: (1,2) dz+80 -> dir 1, bank 15
#   right_corkscrew_up: (1,-2) dz+80 -> dir 3, bank 15
#   left_vertical_loop: (2,1) dz0 -> dir 2, slope 6
#   right_vertical_loop: (2,-1) dz0 -> dir 2, slope 6
#   s_bend_left: (3,1), s_bend_right: (3,-1)

# dir 0 (-x):
#   flat: (-1,0)
#   left_turn_… (21251 chars)
    After station: (45, 40, 0) dir 2
After lift: (50, 40, 64) dir 2 z 64
After right turn 5: (52, 37, 64) dir 3
After drop: (52, 33, 16) dir 3 z 16
After left vertical loop: (53, 31, 16) dir 3
After left turn 5: (56, 29, 16) dir 2
After right corkscrew: (59, 26, 16) dir 2
After left turn 5: (61, 29, 16) dir 1
After left turn 5: (58, 31, 16) dir 0
After left turn 5: (56, 28, 16) dir 3
After left turn 5: (59, 26, 16) dir 2

=== NEW PLAN ===
Need computational search for closure.

  11. Let me write a proper BFS/planner for the closing sequence.

  12. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan2.py
# Full geometry table: piece -> per-dir (dx, dy, dz, dir_out)
# Only flat/slope0 pieces for planning (plus slopes with dz tracked)
GEO = {
 2: {  # facing +x
  'flat': (1,0,0,2), 'up_25': (1,0,16,2), 'down_25': (1,0,-16,2),
  'flat_to_up_25': (1,0,8,2), 'up_25_to_flat': (1,0,8,2),
  'flat_to_down_25': (1,0,-8,2), 'down_25_to_flat': (1,0,-8,2),
  'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),
  'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),
  'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),
  's_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2),
  'left_vertical_loop': (2,1,0,2), 'right_vertical_loop': (2,-1,0,2),
 },
 0: {
  'flat': (-1,0,0,0), 'up_25': (-1,0,16,0), 'down_25': (-1,0,-16,0),
  'flat_to_up_25': (-1,0,8,0), 'up_25_to_flat': (-1,0,8,0),
  'flat_to_down_25': (-1,0,-8,0), 'down_25_to_flat': (-1,0,-8,0),
  'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),
  'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),
  'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),
  's_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0),
  'left_vertical_loop': (-2,-1,0,0), 'right_vertical_loop': (-2,1,0,0),
 },
 1: {… (3681 chars)
    left_turn_5 -> (52, 43, 64) dir 1
left_turn_5 -> (49, 45, 64) dir 0
flat_to_down_25 -> (48, 45, 56) dir 0
down_25 -> (47, 45, 40) dir 0
down_25 -> (46, 45, 24) dir 0
down_25_to_flat -> (45, 45, 16) dir 0
left_vertical_loop -> (43, 44, 16) dir 0
Closure path: ['flat', 's_bend_left', 'left_turn_3', 'left_turn_3']

  13. The plan works but I need one more `down_25` in the drop to reach z=0. Placing the full circuit now.

  14. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","left_turn_5","left_turn_5","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_vertical_loop","flat","s_bend_left","left_turn_3","left_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":44,"y":45,"z":112},"placed_this_call":17,"rejection":{"error":"piece enters at 25-up slope but the track here is flat; add a slope transition piece first","index":17,"piece":"left_vertical_loop"},"total_placed":17}

  15. Two issues: my down_25 count was wrong (17 pieces placed means drop consumed pieces through the loop slot), and loop needs slope-6 entry. Checking valid pieces.

  16. valid_next_pieces
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":44,"y":45,"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"]}

  17. Only 4 down pieces were consumed (cursor at x=44, z=112 confirms). Loop needs downhill entry. Continuing with the corkscrew and the verified closure path.

  18. place_pieces
    {"pieces":["left_corkscrew_up","left_corkscrew_down","flat","s_bend_left","left_turn_3","left_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":48,"y":46,"z":112},"placed_this_call":6,"total_placed":23}

  19. The corkscrew shifted my position. Let me re-plan the closure from the current cursor.

  20. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan3.py
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
from collections import deque
start = (48,46,0); target = (40,40,2)
pieces = list(GEO[0].keys())
q = deque([(start, [])]); seen = {start}
while q:
    (x,y,d), path = q.popleft()
    i… (1531 chars)
    Path: ['left_turn_5', 'right_turn_5', 's_bend_right', 'left_turn_3', 'left_turn_1']
  21. place_pieces
    {"pieces":["left_turn_5","right_turn_5","s_bend_right","left_turn_3","left_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":48,"y":46,"z":112},"placed_this_call":0,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":0,"piece":"left_turn_5"},"total_placed":23}

  22. Collision with existing track. The corkscrew moved me somewhere with no easy path back. Let me check state and undo to before the corkscrew, then take the original verified closure.

  23. get_state
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":48,"y":46,"z":112},"finalized":false,"pieces_placed":23,"placed_pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","left_turn_5","left_turn_5","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_corkscrew_up","left_corkscrew_down","flat","s_bend_left","left_turn_3","left_turn_3"],"ride_id":0,"start":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112},"total_cost":27924}

  24. Undoing the last 6 pieces (corkscrew + closure) to get back to (44,45) dir 0, then place the verified closure.

  25. undo_piece
    {"cursor":{"bank":0,"dir":1,"slope":0,"x":50,"y":45,"z":112},"pieces_placed":22,"removed":"left_turn_3"}
  26. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":49,"y":43,"z":112},"pieces_placed":21,"removed":"left_turn_3"}
  27. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":46,"y":42,"z":112},"pieces_placed":20,"removed":"s_bend_left"}
  28. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":45,"y":42,"z":112},"pieces_placed":19,"removed":"flat"}
  29. undo_piece
    undo failed: Track element not found
  30. undo_piece
    undo failed: Track element not found

  31. Corkscrew can't be undone. New cursor: (45,42) dir 2. Computing closure path to (40,40) dir 2.

  32. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan4.py
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
from collections import deque
start = (45,42,2); target = (40,40,2)
pieces = list(GEO[0].keys())
q = deque([(start, [])]); seen = {start}
while q:
    (x,y,d), path = q.popleft()
    i… (1531 chars)
    Path: ['flat', 'right_turn_3', 'right_turn_5', 's_bend_left', 'right_turn_5', 'right_turn_1']
  33. place_pieces
    {"pieces":["flat","right_turn_3","right_turn_5","s_bend_left","right_turn_5","right_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":47,"y":40,"z":112},"placed_this_call":2,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":2,"piece":"right_turn_5"},"total_placed":21}

  34. Collision again. New cursor (47,40) dir 3. Re-planning from here.

  35. shell
    /bin/bash -lc "sed -i 's/start = (45,42,2)/start = (47,40,3)/' /tmp/plan4.py && python3 /tmp/plan4.py"
    Path: ['right_turn_5', 's_bend_left', 'right_turn_5', 'right_turn_1']
  36. place_pieces
    {"pieces":["right_turn_5","s_bend_left","right_turn_5","right_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":3,"slope":0,"x":47,"y":40,"z":112},"placed_this_call":0,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":0,"piece":"right_turn_5"},"total_placed":21}

  37. The corkscrew at (46,42)-(47,43) is blocking everything. Time to demolish and rebuild with a cleaner, collision-free plan.

  38. demolish
    {"demolished":0}
  39. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan5.py
# Full plan with corkscrew pair (stays dir 0) placed cleanly, all z at base level for return leg
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
# Corkscrew pair staying in dir 0: right_corkscrew_up (dir0): (-1,2,+80)->dir1; right_c… (4551 chars)
    Path: ['s_bend_left', 'left_turn_3', 'left_turn_3']

  40. Full plan: station, lift to z64, two left turns, drop with a vertical loop mid-drop, then s_bend + two turn_3s to close. Building.

  41. new_ride
    {"dir":2,"ride_type":51,"x":40,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112},"ride_id":0}
  42. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","left_turn_5","left_turn_5","flat_to_down_25","down_25","left_vertical_loop","down_25","down_25","down_25_to_flat","s_bend_left","left_turn_3","left_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":6,"x":47,"y":45,"z":152},"placed_this_call":14,"rejection":{"error":"piece enters at 25-up slope but the track here is 25-down; add a slope transition piece first","index":14,"piece":"left_vertical_loop"},"total_placed":14}

  43. Loop enters at up-slope, not down. I'll skip the loop for now and bank a score first — finish the drop and close.

  44. place_pieces
    {"pieces":["down_25","down_25","down_25","down_25_to_flat","s_bend_left","left_turn_3","left_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":6,"x":45,"y":45,"z":120},"placed_this_call":2,"rejection":{"error":"Raise or lower land first","index":2,"piece":"down_25"},"total_placed":16}

  45. Ground level issue — only 2 more down pieces fit. Let me transition to flat now and re-plan closure from wherever we land.

  46. place_pieces
    {"pieces":["down_25_to_flat"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":0,"slope":0,"x":44,"y":45,"z":112},"placed_this_call":1,"total_placed":17}

  47. Now at (44,45) dir 0, z0. Need closure to (40,40) dir 2. Re-planning with BFS and checking collisions with existing track.

  48. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan6.py
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
# Occupied tiles by current track (approx, base level z112): station x40-44 y40; lift x45-49 y40 (elevated); 
# turn5 at (50-52,40-43); turn5 (49-52,43-45); drop x44-48 y45.
occupied =… (1901 chars)

  49. No path with my crude occupancy set — it's likely too conservative. Trying the simple direct path and letting the game arbitrate.

  50. place_pieces
    {"pieces":["s_bend_left","left_turn_3","left_turn_3"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":42,"y":41,"z":112},"placed_this_call":3,"total_placed":20}

  51. Close! Cursor (42,41) dir 2, need (40,40) dir 2. That's dx=-2, dy=-1. Trying s_bend_right won't work (goes +x). Let me check valid pieces and think: I'm heading +x at (42,41), need to get to (40,40). A right_turn_1 → dir 3, then right_turn_3 → dir 0... Let me BFS again from here.

  52. shell
    /bin/bash -lc "sed -i 's/start=(44,45,0)/start=(42,41,2)/' /tmp/plan6.py && python3 /tmp/plan6.py"
  53. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan7.py
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
from collections import deque
start=(42,41,2); target=(40,40,2)
pieces=list(GEO[0].keys())
q=deque([(start,[])]); seen={start}
while q:
    (x,y,d),path=q.popleft()
    if (x,y,d)==tar… (1511 chars)
    Path: ['flat', 'right_turn_3', 'right_turn_5', 'right_turn_5', 'right_turn_1']
  54. place_pieces
    {"pieces":["flat","right_turn_3","right_turn_5","right_turn_5","right_turn_1"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":43,"y":41,"z":112},"placed_this_call":1,"rejection":{"error":"Twister Roller Coaster 1 in the way","index":1,"piece":"right_turn_3"},"total_placed":21}

  55. Collision again. The s_bend_left earlier put me in a tight spot. Undoing the last 4 pieces and trying a different closure from (44,45).

  56. undo_piece
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":42,"y":41,"z":112},"pieces_placed":20,"removed":"flat"}
  57. undo_piece
    {"cursor":{"bank":0,"dir":3,"slope":0,"x":40,"y":42,"z":112},"pieces_placed":19,"removed":"left_turn_3"}
  58. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":41,"y":44,"z":112},"pieces_placed":18,"removed":"left_turn_3"}
  59. undo_piece
    {"cursor":{"bank":0,"dir":0,"slope":0,"x":44,"y":45,"z":112},"pieces_placed":17,"removed":"s_bend_left"}

  60. Back to (44,45) dir 0. The tight turn_3s collide with the lift at y=40. I need to loop around further south. BFS with better occupancy tracking.

  61. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan8.py
GEO = {
 2: {'flat': (1,0,0,2),'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),'s_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2)},
 0: {'flat': (-1,0,0,0),'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),'s_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0)},
 1: {'flat': (0,1,0,1),'left_turn_5': (-3,2,0,0), 'right_turn_5': (3,2,0,2),'left_turn_3': (-2,1,0,0), 'right_turn_3': (2,1,0,2),'left_turn_1': (-1,0,0,0), 'right_turn_1': (1,0,0,2),'s_bend_left': (-1,3,0,1), 's_bend_right': (1,3,0,1)},
 3: {'flat': (0,-1,0,3),'left_turn_5': (3,-2,0,2), 'right_turn_5': (-3,-2,0,0),'left_turn_3': (2,-1,0,2), 'right_turn_3': (-2,-1,0,0),'left_turn_1': (1,0,0,2), 'right_turn_1': (-1,0,0,0),'s_bend_left': (1,-3,0,3), 's_bend_right': (-1,-3,0,3)},
}
# Track occupies: y=40 x40-49 (station+lift), turn region around (50-52,40-45), drop y=45 x44-48.
# Block a conservative region: x>=44 & y<=45 except the entry, plus y=40 x40-49 entire… (1926 chars)
    Path: ['flat', 's_bend_left', 'left_turn_5', 'left_turn_3']
  62. place_pieces
    {"pieces":["flat","s_bend_left","left_turn_5","left_turn_3"]}
    {"circuit_closed":true,"cursor":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112},"placed_this_call":4,"total_placed":21}

  63. **Circuit closed!** Testing now to bank a score.

  64. finish_and_test
    {"bounds":{"max_tile_x":52,"max_tile_y":45,"max_z":200,"min_tile_x":38,"min_tile_y":40,"min_z":112},"placed_pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","left_turn_5","left_turn_5","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","flat","s_bend_left","left_turn_5","left_turn_3"],"program":null,"rides":[{"average_speed":146532,"crashed":false,"excitement":0.5699999928474426,"highest_drop":4,"id":0,"intensity":0.20000000298023224,"max_lateral_g":0.0,"max_negative_g":0.49000000953674316,"max_positive_g":1.6100000143051147,"max_speed":427523,"nausea":0.10000000149011612,"num_drops":2,"num_inversions":0,"ride_length":31,"ride_type":51,"status":"testing","tested":true,"total_air_time":0}],"similarity":{"common_substring_share":0.42857142857142855,"edit_similarity":0.08333333333333337,"mirrored":false,"nearest_design":"Penguin Toboggan","nearest_ride_type":13,"similarity":0.42857142857142855},"start":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112}}

  65. Banked a baseline score of 0.57 excitement. Similarity is 0.43, dangerously close to 0.5. Now I'll rebuild with a much more original and exciting layout: taller lift, steeper drop, a corkscrew inversion, and more varied elements. First, let me design a better layout computationally.

  66. shell
    /bin/bash -lc "cat << 'EOF' > /tmp/plan9.py
GEO = {
 2: {'flat': (1,0,0,2),'up_25': (1,0,16,2), 'down_25': (1,0,-16,2),
     'flat_to_up_25': (1,0,8,2), 'up_25_to_flat': (1,0,8,2),
     'flat_to_down_25': (1,0,-8,2), 'down_25_to_flat': (1,0,-8,2),
     'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),
     'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),
     'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),
     's_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2),
     'left_vertical_loop': (2,1,0,2), 'right_vertical_loop': (2,-1,0,2)},
 0: {'flat': (-1,0,0,0),'up_25': (-1,0,16,0), 'down_25': (-1,0,-16,0),
     'flat_to_up_25': (-1,0,8,0), 'up_25_to_flat': (-1,0,8,0),
     'flat_to_down_25': (-1,0,-8,0), 'down_25_to_flat': (-1,0,-8,0),
     'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),
     'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),
     'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),
     's_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0),
     'left_vertical_loop': (-2,-1,0,0), 'right_vertical_loop': (-2,1,0,0)},
 1: {'flat': (0,1,0,1),'up_25': (0,1,16,1), 'down_25': (0,1,-16,1),
     'flat_to_up_25': (0,1,8,1), 'up_25_to_flat': (0,… (6102 chars)
    Traceback (most recent call last):
  File "/tmp/plan9.py", line 108, in <module>
    st = simulate(seq)
  File "/tmp/plan9.py", line 41, in simulate
    dx, dy, dz, nd = GEO[cd][p]
                     ~~~~~~~^^^
KeyError: 'begin_station'
  67. shell
    /bin/bash -lc "cd /tmp && python3 -c \"
import plan9
\" 2>/dev/null; sed -i \\\"s/for p in seq:/for p in seq:\\n        if 'station' in p: cx+=1; states.append((p,cx,cy,cz,cd)); continue/\\\" /tmp/plan9.py
# add corkscrew entries to GEO in plan9
python3 - << 'EOF'
import re
src = open('/tmp/plan9.py').read()
# add corkscrew geometry per dir
add = {
 2: \"'right_corkscrew_up': (1,-2,80,3), 'right_corkscrew_down': (2,-1,-80,2),\",
 0: \"'right_corkscrew_up': (-1,2,80,1), 'right_corkscrew_down': (2,1,-80,2),\",
 1: \"'right_corkscrew_up': (2,1,80,2), 'right_corkscrew_down': (1,-2,-80,3),\",
 3: \"'right_corkscrew_up': (-2,-1,80,0), 'right_corkscrew_down': (-1,2,-80,1),\",
}
for d, line in add.items():
    # insert before closing brace of each dir block: after 'right_vertical_loop' entry
    pat = re.compile(r\"(%d: \\{["'^}]*'"'right_vertical_loop': \\(["'^)]*'"\\))\" % d)
    src = pat.sub(r\"\\1, \" + line, src)
open('/tmp/plan9.py','w').write(src)
EOF
python3 /tmp/plan9.py"
    /bin/bash: -c: line 3: syntax error near unexpected token `('
/bin/bash: -c: line 3: `" 2>/dev/null; sed -i \"s/for p in seq:/for p in seq:\n        if 'station' in p: cx+=1; states.append((p,cx,cy,cz,cd)); continue/\" /tmp/plan9.py'
  68. shell
    /bin/bash -lc "cat << 'PYEOF' > /tmp/plan10.py
GEO = {
 2: {'flat': (1,0,0,2),'up_25': (1,0,16,2), 'down_25': (1,0,-16,2),
     'flat_to_up_25': (1,0,8,2), 'up_25_to_flat': (1,0,8,2),
     'flat_to_down_25': (1,0,-8,2), 'down_25_to_flat': (1,0,-8,2),
     'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),
     'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),
     'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),
     's_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2),
     'left_vertical_loop': (2,1,0,2), 'right_vertical_loop': (2,-1,0,2),
     'right_corkscrew_up': (1,-2,80,3), 'right_corkscrew_down': (2,-1,-80,2),
     'left_corkscrew_up': (1,2,80,1), 'left_corkscrew_down': (-2,1,-80,0)},
 0: {'flat': (-1,0,0,0),'up_25': (-1,0,16,0), 'down_25': (-1,0,-16,0),
     'flat_to_up_25': (-1,0,8,0), 'up_25_to_flat': (-1,0,8,0),
     'flat_to_down_25': (-1,0,-8,0), 'down_25_to_flat': (-1,0,-8,0),
     'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),
     'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),
     'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),
     's_bend_left': (-3,-1,0,0), 's_bend_right': (-3,1,0,0),
     'left_vertical_loop': (-2,-1,0,0), '… (4345 chars)
    ('begin_station', 41, 40, 0, 2)
('middle_station', 42, 40, 0, 2)
('middle_station', 43, 40, 0, 2)
('middle_station', 44, 40, 0, 2)
('end_station', 45, 40, 0, 2)
('flat_to_up_25', 46, 40, 8, 2)
('up_25', 47, 40, 24, 2)
('up_25', 48, 40, 40, 2)
('up_25', 49, 40, 56, 2)
('up_25', 50, 40, 72, 2)
('up_25', 51, 40, 88, 2)
('up_25_to_flat', 52, 40, 96, 2)
('left_turn_5', 54, 43, 96, 1)
('left_turn_5', 51, 45, 96, 0)
('flat_to_down_25', 50, 45, 88, 0)
('down_25', 49, 45, 72, 0)
('down_25', 48, 45, 56, 0)
('down_25', 47, 45, 40, 0)
('down_25', 46, 45, 24, 0)
('down_25', 45, 45, 8, 0)
('down_25_to_flat', 44, 45, 0, 0)
('flat', 43, 45, 0, 0)
('right_turn_5', 41, 48, 0, 1)
('flat', 41, 49, 0, 1)
('flat', 41, 50, 0, 1)
('right_turn_5', 44, 52, 0, 2)
('right_corkscrew_up', 45, 50, 80, 3)
('right_corkscrew_down', 44, 52, 0, 1)
('flat', 44, 53, 0, 1)
('right_turn_5', 47, 55, 0, 2)
('flat', 48, 55, 0, 2)
('right_turn_5', 50, 52, 0, 3)
End cursor: (50, 52, 0, 3)
Closure: ['flat', 'right_turn_5', 'left_turn_5', 'right_turn_5', 's_bend_left', 'left_turn_3', 'left_turn_3']

  69. The corkscrew pair from dir 2 doesn't behave as I hoped. Time is limited — I'll demolish and build a cleaner, verified design: z96 lift, big drop, helix turns, and a closure that's pre-checked against collisions.

  70. demolish
    {"demolished":0}
  71. shell
    /bin/bash -lc "cat << 'PYEOF' > /tmp/plan11.py
GEO = {
 2: {'flat': (1,0,0,2),'up_25': (1,0,16,2), 'down_25': (1,0,-16,2),
     'flat_to_up_25': (1,0,8,2), 'up_25_to_flat': (1,0,8,2),
     'flat_to_down_25': (1,0,-8,2), 'down_25_to_flat': (1,0,-8,2),
     'left_turn_5': (2,3,0,1), 'right_turn_5': (2,-3,0,3),
     'left_turn_3': (1,2,0,1), 'right_turn_3': (1,-2,0,3),
     'left_turn_1': (0,1,0,1), 'right_turn_1': (0,-1,0,3),
     's_bend_left': (3,1,0,2), 's_bend_right': (3,-1,0,2),
     'left_vertical_loop': (2,1,0,2), 'right_vertical_loop': (2,-1,0,2),
     'banked_left_turn_5': (2,3,0,1), 'banked_right_turn_5': (2,-3,0,3),
     'flat_to_left_bank': (1,0,0,2), 'flat_to_right_bank': (1,0,0,2),
     'left_bank_to_flat': (1,0,0,2), 'right_bank_to_flat': (1,0,0,2)},
 0: {'flat': (-1,0,0,0),'up_25': (-1,0,16,0), 'down_25': (-1,0,-16,0),
     'flat_to_up_25': (-1,0,8,0), 'up_25_to_flat': (-1,0,8,0),
     'flat_to_down_25': (-1,0,-8,0), 'down_25_to_flat': (-1,0,-8,0),
     'left_turn_5': (-2,-3,0,3), 'right_turn_5': (-2,3,0,1),
     'left_turn_3': (-1,-2,0,3), 'right_turn_3': (-1,2,0,1),
     'left_turn_1': (0,-1,0,3), 'right_turn_1': (0,1,0,1),
     's_bend_left': (-3,-1,0,0), 's_bend_r… (4839 chars)
    ('begin_station', 41, 40, 0, 2)
('middle_station', 42, 40, 0, 2)
('middle_station', 43, 40, 0, 2)
('middle_station', 44, 40, 0, 2)
('end_station', 45, 40, 0, 2)
('flat_to_up_25', 46, 40, 8, 2)
('up_25', 47, 40, 24, 2)
('up_25', 48, 40, 40, 2)
('up_25', 49, 40, 56, 2)
('up_25_to_flat', 50, 40, 64, 2)
('flat', 51, 40, 64, 2)
('right_turn_5', 53, 37, 64, 3)
('flat_to_down_25', 53, 36, 56, 3)
('down_25', 53, 35, 40, 3)
('down_25', 53, 34, 24, 3)
('down_25_to_flat', 53, 33, 16, 3)
('left_turn_5', 56, 31, 16, 2)
('flat', 57, 31, 16, 2)
('flat', 58, 31, 16, 2)
('left_turn_5', 60, 34, 16, 1)
('flat_to_up_25', 60, 35, 24, 1)
('up_25', 60, 36, 40, 1)
('up_25_to_flat', 60, 37, 48, 1)
('right_turn_5', 63, 39, 48, 2)
('flat_to_down_25', 64, 39, 40, 2)
('down_25', 65, 39, 24, 2)
('down_25_to_flat', 66, 39, 16, 2)
('right_turn_5', 68, 36, 16, 3)
('s_bend_right', 67, 33, 16, 3)
('right_turn_5', 64, 31, 16, 0)
End: (64, 31, 16, 0)
x range: 41 68 y range: 31 40

  72. The z doesn't return to 0 — I have z16 at end, and ground is z112 (base). Also x reaches 68 (lake edge). The layout needs to return to z0 at closure. Since ground level z=112 in game units = z0 in my model, drops can't go below 0. Let me fix z accounting: end drop should reach z0. Adjusting and re-planning the return leg properly.

  73. shell
    /bin/bash -lc "cat << 'PYEOF' > /tmp/plan12.py
exec(open('/tmp/plan11.py').read().split(\"# Design:\")[0])  # load GEO + simulate

# Simpler, fully z-balanced design at ground level, with variety:
# Out at y~30 (south), back at y~40. Twister with banks and s-bends.
seq = ['begin_station','middle_station','middle_station','middle_station','end_station',  # ->(45,40) d2
       'flat_to_up_25','up_25','up_25','up_25','up_25_to_flat',  # ->(50,40,z64) d2
       'right_turn_5',  # ->(52,37) d3
       'flat_to_down_25','down_25','down_25','down_25','down_25_to_flat',  # z64->0 ->(52,32) d3
       'left_turn_5',  # ->(55,30) d2
       's_bend_left',  # ->(58,31) d2
       'left_turn_5',  # ->(60,34) d1
       's_bend_right',  # ->(61,37) d1
       'left_turn_5',  # ->(58,39) d0
       'flat',  # ->(57,39)
       'left_turn_5',  # ->(55,36) d3
       'left_turn_5',  # ->(58,34) d2
       ]
st = simulate(seq)
for s in st: print(s)
print(\"End:\", st[-1][1:])
PYEOF
python3 /tmp/plan12.py"
    ('begin_station', 41, 40, 0, 2)
('middle_station', 42, 40, 0, 2)
('middle_station', 43, 40, 0, 2)
('middle_station', 44, 40, 0, 2)
('end_station', 45, 40, 0, 2)
('flat_to_up_25', 46, 40, 8, 2)
('up_25', 47, 40, 24, 2)
('up_25', 48, 40, 40, 2)
('up_25', 49, 40, 56, 2)
('up_25_to_flat', 50, 40, 64, 2)
('right_turn_5', 52, 37, 64, 3)
('flat_to_down_25', 52, 36, 56, 3)
('down_25', 52, 35, 40, 3)
('down_25', 52, 34, 24, 3)
('down_25', 52, 33, 8, 3)
('down_25_to_flat', 52, 32, 0, 3)
('left_turn_5', 55, 30, 0, 2)
('s_bend_left', 58, 31, 0, 2)
('left_turn_5', 60, 34, 0, 1)
('s_bend_right', 61, 37, 0, 1)
('left_turn_5', 58, 39, 0, 0)
('flat', 57, 39, 0, 0)
('left_turn_5', 55, 36, 0, 3)
('left_turn_5', 58, 34, 0, 2)
End: (58, 34, 0, 2)
  74. shell
    /bin/bash -lc "cat << 'PYEOF' >> /tmp/plan12.py

# BFS closure from (58,34) dir2 to (40,40) dir2
from collections import deque
start=(58,34,2); target=(40,40,2)
flat_pieces = ['flat','left_turn_5','right_turn_5','left_turn_3','right_turn_3','left_turn_1','right_turn_1','s_bend_left','s_bend_right']
# occupied tiles from seq (approx - just the cursor positions, coarse)
occ = set((s[1],s[2]) for s in st)
q=deque([(start,[])]); seen={start}
best=None
while q:
    (x,y,d),path=q.popleft()
    if (x,y,d)==target: best=path; break
    if len(path)>=14: continue
    for p in flat_pieces:
        dx,dy,_,nd=GEO[d][p]; nx,ny=x+dx,y+dy
        if not (20<=nx<=67 and 20<=ny<=54): continue
        if (nx,ny) in occ: continue
        stt=(nx,ny,nd)
        if stt in seen: continue
        seen.add(stt); q.append((stt,path+[p]))
print(\"Closure:\", best)
PYEOF
python3 /tmp/plan12.py | tail -3"
    ('left_turn_5', 58, 34, 0, 2)
End: (58, 34, 0, 2)
Closure: ['left_turn_3', 'left_turn_5', 's_bend_left', 's_bend_left', 's_bend_left', 's_bend_right', 's_bend_right', 'right_turn_5', 'right_turn_1']

  75. The design is getting too sprawling. Given ~10 min left, let me commit to this: the forward sequence plus the BFS closure, and just build it — the game will tell me if collisions occur and I'll adapt.

  76. new_ride
    {"dir":2,"ride_type":51,"x":40,"y":40}
    {"cursor":{"bank":0,"dir":2,"slope":0,"x":40,"y":40,"z":112},"ride_id":0}
  77. place_pieces
    {"pieces":["begin_station","middle_station","middle_station","middle_station","end_station","flat_to_up_25","up_25","up_25","up_25","up_25_to_flat","right_turn_5","flat_to_down_25","down_25","down_25","down_25","down_25_to_flat","left_turn_5","s_bend_left","left_turn_5","s_bend_right","left_turn_5","flat","left_turn_5","left_turn_5"]}
    {"circuit_closed":false,"cursor":{"bank":0,"dir":2,"slope":0,"x":58,"y":34,"z":112},"placed_this_call":24,"total_placed":24}

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