{
 "grid_size": 10,
 "polyominos": [
  {
   "tiles": [
    [
     9,
     1
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 0,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     4,
     9
    ],
    [
     5,
     9
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 1,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     8,
     3
    ],
    [
     9,
     3
    ],
    [
     9,
     4
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 2,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     1,
     3
    ],
    [
     2,
     2
    ],
    [
     2,
     3
    ]
   ],
   "piece_type": "MOVABLE",
   "poly_id": 3,
   "color": [
    100,
    0,
    100
   ]
  },
  {
   "tiles": [
    [
     0,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     0,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     1,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     2,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     3,
     2
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     4,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     5,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     1
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     3
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     6,
     5
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     7,
     9
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     8,
     4
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     0
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     6
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     7
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     8
    ]
   ],
   "piece_type": "BARRIER"
  },
  {
   "tiles": [
    [
     9,
     9
    ]
   ],
   "piece_type": "BARRIER"
  }
 ],
 "level_color": [
  100,
  0,
  100
 ],
 "meta": {
  "generator": "mutate_harden",
  "preset": "10x10/4",
  "tier": "hard",
  "seed_optimal": 12,
  "harden_seconds": 76,
  "harden_restarts": 1,
  "hard_target": 43,
  "brutal": false,
  "soft_flaws": [
   "same piece-size profile as the previous day [1, 2, 3, 3]"
  ],
  "hard_flaws": [],
  "beautify": {
   "removed": 0,
   "filled": 3
  },
  "taste": {
   "score": 2,
   "verdict": "tidy",
   "summary": "The board is cluttered with several isolated barrier dots and a stray cell on the shell, making it look machine-generated rather than hand-designed.",
   "issues": [
    {
     "kind": "random_dot",
     "cells": [
      [
       3,
       2
      ]
     ],
     "note": "Lone barrier dot floating in the upper left quadrant."
    },
    {
     "kind": "random_dot",
     "cells": [
      [
       4,
       4
      ]
     ],
     "note": "Lone barrier dot floating near the center."
    },
    {
     "kind": "random_dot",
     "cells": [
      [
       5,
       8
      ]
     ],
     "note": "Lone barrier dot floating in the bottom center."
    },
    {
     "kind": "random_dot",
     "cells": [
      [
       2,
       6
      ]
     ],
     "note": "Lone barrier dot floating in the bottom left."
    },
    {
     "kind": "ragged_shell",
     "cells": [
      [
       9,
       0
      ]
     ],
     "note": "Single barrier cell at the top right corner of the shell looks like a stray pixel."
    },
    {
     "kind": "scatter",
     "cells": [
      [
       4,
       6
      ],
      [
       4,
       7
      ]
     ],
     "note": "Small isolated vertical fragment that doesn't align with other structures."
    }
   ],
   "suggest_fill": [],
   "suggest_remove": [
    [
     3,
     2
    ],
    [
     4,
     4
    ],
    [
     5,
     8
    ],
    [
     2,
     6
    ],
    [
     9,
     0
    ]
   ],
   "model": "gemma4:31b"
  },
  "space": {
   "optimal": 43,
   "states": 22733,
   "dead_frac": 0.807,
   "optimal_lines": 514130534400,
   "progress_frac": 0.274,
   "fatal_frac": 0.167,
   "fatal_merge_frac": 0.889,
   "forced_frac": 0.302,
   "survive_random": 0.0003,
   "mean_branching": 6.7,
   "solvable_frac": 0.193,
   "min_carry": 5,
   "carry_frac": 0.116
  },
  "id": "daily_2026-10-22_hard",
  "date": "2026-10-22",
  "band": "hard",
  "difficulty_score": 0.87,
  "optimal_len": 43,
  "title": "Oct 22",
  "rev": "54d8d5cb"
 }
}