RUN 20260723-v3-twister-design (design)

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

Standings

design mode — models build from scratch

modelscoreintensitynausea similaritybesttokens / cost
1st claude-opus-4-6 0.24 0.07 0.03 0.57 round 1/6 —
2nd claude-haiku-4-5 no successful coaster —
3rd claude-sonnet-5 no successful coaster —

score = excitement, scaled down when similarity to a stock library design exceeds 0.5 (an exact or mirrored copy scores 0)

claude-opus-4-6full detail →
excitementintensity×build failed
0515intensity ceiling 10round 1: excitement 0.280.28round 1: intensity 0.07R1×round 2: build failed (45/45 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (42, 53, z=112, dir=2, bank=0, slope=0); a closed circuit requires these to be identical]R2×round 3: build failed at piece 56 (56/66 pieces placed): rejected at cursor (x=62, y=56, z=112, dir=0): Twister Roller Coaster 1 in the wayR3×round 4: build failed (44/44 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (22, 58, z=112, dir=3, bank=0, slope=0); a closed circuit requires these to be identical]R4×round 5: build failed (62/62 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (54, 62, z=112, dir=3, bank=0, slope=0); a closed circuit requires these to be identical]R5×round 6: build failed at piece 71 (71/75 pieces placed): rejected at cursor (x=33, y=48, z=112, dir=1): Twister Roller Coaster 1 in the wayR6

Round 1

excitement 0.28 intensity 0.07 nausea 0.03 length 112 drops 0 airtime 0 tested ok similarity 0.57 (nearest: River Of The Damned) penalized score 0.24
track program (14 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "middle_station",
    "end_station",
    "right_turn_5",
    "flat",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "flat",
    "right_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 40,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 1 view 1

Round 2 build failed

build failed (45/45 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (42, 53, z=112, dir=2, bank=0, slope=0); a closed circuit requires these to be identical]

track program (45 pieces)
{
  "pieces": [
    "begin_station",
    "middle_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"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25_to_flat",
    "right_turn_5",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "right_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 2 view 1

Round 3 build failed

build failed at piece 56 (56/66 pieces placed): rejected at cursor (x=62, y=56, z=112, dir=0): Twister Roller Coaster 1 in the way

track program (66 pieces)
{
  "pieces": [
    "begin_station",
    "middle_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"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "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",
    "left_bank_to_flat",
    "flat_to_up_25",
    "right_vertical_loop",
    "down_25_to_flat",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "flat_to_right_bank",
    "banked_right_turn_5",
    "right_bank_to_flat",
    "brakes",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "flat",
    "right_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 3 view 1

Round 4 build failed

build failed (44/44 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (22, 58, z=112, dir=3, bank=0, slope=0); a closed circuit requires these to be identical]

track program (44 pieces)
{
  "pieces": [
    "begin_station",
    "middle_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"
    },
    "up_25_to_flat",
    "left_turn_5",
    "flat_to_down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "left_turn_5",
    "flat_to_up_25",
    "right_vertical_loop",
    "down_25_to_flat",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "left_turn_5",
    "flat_to_right_bank",
    "banked_right_turn_5",
    "right_bank_to_flat",
    "brakes",
    "flat",
    "flat",
    "flat",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 4 view 1

Round 5 build failed

build failed (62/62 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (30, 50, z=112, dir=2, bank=0, slope=0) and ends at tile (54, 62, z=112, dir=3, bank=0, slope=0); a closed circuit requires these to be identical]

track program (62 pieces)
{
  "pieces": [
    "begin_station",
    "middle_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"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "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",
    "left_bank_to_flat",
    "flat_to_up_25",
    "right_vertical_loop",
    "down_25_to_flat",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "flat_to_right_bank",
    "banked_right_turn_5",
    "right_bank_to_flat",
    "brakes",
    "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",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat_to_left_bank",
    "banked_left_turn_5",
    "left_bank_to_flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat",
    "flat"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 5 view 1

Round 6 build failed

build failed at piece 71 (71/75 pieces placed): rejected at cursor (x=33, y=48, z=112, dir=1): Twister Roller Coaster 1 in the way

track program (75 pieces)
{
  "pieces": [
    "begin_station",
    "middle_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"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25",
    "down_25_to_flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "flat_to_up_25",
    "right_vertical_loop",
    "down_25_to_flat",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_5",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "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",
    "flat",
    "flat",
    "flat",
    "right_turn_5",
    "s_bend_left",
    "flat",
    "flat",
    "right_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 2,
    "x": 30,
    "y": 50
  }
}
park screenshot, claude-opus-4-6 round 6 view 1
claude-haiku-4-5full detail →
excitementintensity×build failed
0515intensity ceiling 10×round 1: build failed at piece 30 (30/47 pieces placed): rejected at cursor (x=54, y=60, z=168, dir=0): Twister Roller Coaster 1 in the wayR1×round 2: build failed (49/49 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (61, 60, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]R2×round 3: build failed at piece 26 (26/49 pieces placed): rejected at cursor (x=59, y=61, z=120, dir=0): Raise or lower land firstR3×round 4: build failed at piece 24 (24/50 pieces placed): rejected at cursor (x=54, y=60, z=128, dir=3): Twister Roller Coaster 1 in the wayR4×round 5: build failed at piece 31 (31/53 pieces placed): rejected at cursor (x=54, y=61, z=160, dir=3): Twister Roller Coaster 1 in the wayR5×round 6: build failed at piece 37 (37/51 pieces placed): rejected at cursor (x=46, y=59, z=128, dir=0): Twister Roller Coaster 1 in the wayR6

Round 1 build failed

build failed at piece 30 (30/47 pieces placed): rejected at cursor (x=54, y=60, z=168, dir=0): Twister Roller Coaster 1 in the way

track program (47 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 1 view 1

Round 2 build failed

build failed (49/49 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (61, 60, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]

track program (49 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 2 view 1

Round 3 build failed

build failed at piece 26 (26/49 pieces placed): rejected at cursor (x=59, y=61, z=120, dir=0): Raise or lower land first

track program (49 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 3 view 1

Round 4 build failed

build failed at piece 24 (24/50 pieces placed): rejected at cursor (x=54, y=60, z=128, dir=3): Twister Roller Coaster 1 in the way

track program (50 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 4 view 1

Round 5 build failed

build failed at piece 31 (31/53 pieces placed): rejected at cursor (x=54, y=61, z=160, dir=3): Twister Roller Coaster 1 in the way

track program (53 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 5 view 1

Round 6 build failed

build failed at piece 37 (37/51 pieces placed): rejected at cursor (x=46, y=59, z=128, dir=0): Twister Roller Coaster 1 in the way

track program (51 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_left_bank",
    "left_bank",
    "left_bank_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "right_turn_5",
    "flat",
    "flat_to_up_25",
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "flat_to_down_25",
    "down_25",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "flat",
    "left_turn_5"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-haiku-4-5 round 6 view 1
claude-sonnet-5full detail →
excitementintensity×build failed
0515intensity ceiling 10×round 1: build failed (40/40 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (50, 76, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]R1×round 2: build failed (37/37 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (51, 76, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]R2×round 3: build failed at piece 38 (38/41 pieces placed): rejected at cursor (x=53, y=71, z=160, dir=3): Twister Roller Coaster 1 in the wayR3×round 4: build failed at piece 37 (37/38 pieces placed): rejected at cursor (x=50, y=69, z=176, dir=2): Twister Roller Coaster 1 in the wayR4×round 5: build failed (37/37 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (51, 74, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]R5×round 6: build failed (38/38 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (50, 70, z=176, dir=2, bank=0, slope=0); a closed circuit requires these to be identical]R6

Round 1 build failed

build failed (40/40 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (50, 76, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]

track program (40 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "flat",
    "right_turn_5",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_5",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "brakes",
    "flat"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 1 view 1

Round 2 build failed

build failed (37/37 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (51, 76, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]

track program (37 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "right_turn_5",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_5",
    "left_turn_5",
    "left_turn_5",
    "brakes",
    "flat"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 2 view 1

Round 3 build failed

build failed at piece 38 (38/41 pieces placed): rejected at cursor (x=53, y=71, z=160, dir=3): Twister Roller Coaster 1 in the way

track program (41 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "right_turn_5",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_5",
    "left_turn_5",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25_to_flat",
    "brakes",
    "left_turn_3",
    "left_turn_3"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 3 view 1

Round 4 build failed

build failed at piece 37 (37/38 pieces placed): rejected at cursor (x=50, y=69, z=176, dir=2): Twister Roller Coaster 1 in the way

track program (38 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "right_turn_5",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "brakes",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "left_turn_3",
    "left_turn_3"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 4 view 1

Round 5 build failed

build failed (37/37 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (51, 74, z=176, dir=0, bank=0, slope=0); a closed circuit requires these to be identical]

track program (37 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "right_turn_3",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_3",
    "left_turn_5",
    "left_turn_5",
    "brakes",
    "flat"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 5 view 1

Round 6 build failed

build failed (38/38 pieces placed): set_status(testing): Track is not a complete circuit [track starts at tile (60, 60, z=112, dir=0, bank=0, slope=0) and ends at tile (50, 70, z=176, dir=2, bank=0, slope=0); a closed circuit requires these to be identical]

track program (38 pieces)
{
  "pieces": [
    "begin_station",
    "middle_station",
    "end_station",
    {
      "t": "flat_to_up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    {
      "chain": true,
      "t": "up_25"
    },
    "up_25_to_up_60",
    {
      "t": "up_60"
    },
    "up_60_to_flat",
    "flat",
    "left_turn_3",
    "left_turn_3",
    "flat_to_down_25",
    "down_25",
    "down_25_to_down_60",
    "down_60",
    "down_60_to_flat",
    "flat",
    "flat_to_up_25",
    "left_vertical_loop",
    "down_25_to_flat",
    "flat",
    "left_turn_5",
    "left_turn_5",
    "flat",
    "flat_to_up_25",
    "up_25",
    "up_25_to_flat",
    "right_turn_3",
    "left_corkscrew_up",
    "right_corkscrew_down",
    "right_turn_3",
    "left_turn_1",
    "brakes",
    "left_turn_5",
    "left_turn_5",
    "left_turn_1"
  ],
  "ride_type": 51,
  "start": {
    "dir": 0,
    "x": 60,
    "y": 60
  }
}
park screenshot, claude-sonnet-5 round 6 view 1

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