{
 "grid_size": 12,
 "polyominos": [
  {
   "tiles": [
    [
     1,
     1
    ],
    [
     1,
     2
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 0,
   "color": [
    100,
    30,
    70
   ]
  },
  {
   "tiles": [
    [
     9,
     11
    ],
    [
     10,
     11
    ],
    [
     11,
     11
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 1,
   "color": [
    100,
    30,
    70
   ]
  },
  {
   "tiles": [
    [
     3,
     0
    ],
    [
     3,
     1
    ],
    [
     3,
     2
    ],
    [
     4,
     1
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 2,
   "color": [
    100,
    30,
    70
   ]
  },
  {
   "tiles": [
    [
     5,
     6
    ],
    [
     6,
     5
    ],
    [
     6,
     6
    ],
    [
     6,
     7
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 3,
   "color": [
    100,
    30,
    70
   ]
  },
  {
   "tiles": [
    [
     0,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     10
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     11
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     10
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     11
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     10
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     11
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     10
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     11
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     11
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     10,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     11,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     11,
     9
    ]
   ],
   "piece_type": "BARRIER"
  }
 ],
 "level_color": [
  100,
  30,
  70
 ],
 "meta": {
  "generator": "mutate_harden",
  "preset": "12x12/4",
  "tier": "medium",
  "seed_optimal": 14,
  "harden_seconds": 5,
  "harden_restarts": 1,
  "hard_target": 26,
  "brutal": false,
  "soft_flaws": [],
  "hard_flaws": [],
  "beautify": {
   "removed": 0,
   "filled": 5
  },
  "taste": {
   "score": 3,
   "verdict": "tidy",
   "summary": "The board has a generally structured layout, but several isolated barrier dots look like machine-generated noise rather than deliberate design.",
   "issues": [
    {
     "kind": "random_dot",
     "cells": [
      [
       8,
       4
      ]
     ],
     "note": "Lone barrier dot floating in the middle of the right-hand open area."
    },
    {
     "kind": "random_dot",
     "cells": [
      [
       4,
       6
      ]
     ],
     "note": "Lone barrier dot floating in the middle of the left-hand open area."
    },
    {
     "kind": "ragged_shell",
     "cells": [
      [
       8,
       0
      ]
     ],
     "note": "Single barrier cell on the top edge looks like a stray notch."
    }
   ],
   "suggest_fill": [],
   "suggest_remove": [
    [
     8,
     4
    ],
    [
     4,
     6
    ],
    [
     8,
     0
    ]
   ],
   "model": "gemma4:31b"
  },
  "space": {
   "optimal": 26,
   "states": 25749,
   "dead_frac": 0.655,
   "optimal_lines": 3372918,
   "progress_frac": 0.232,
   "fatal_frac": 0.149,
   "fatal_merge_frac": 0.9,
   "forced_frac": 0.538,
   "survive_random": 0.0194,
   "mean_branching": 6.96,
   "solvable_frac": 0.345,
   "min_carry": 5,
   "carry_frac": 0.192
  },
  "id": "daily_2026-10-31_medium",
  "date": "2026-10-31",
  "band": "medium",
  "difficulty_score": 0.553,
  "optimal_len": 26,
  "title": "Oct 31",
  "rev": "5245619a"
 }
}