{
  "schemaVersion": "1.0",
  "id": "en-sudoku-0015-1nlujr",
  "type": "sudoku",
  "locale": "en",
  "slug": "sudoku-challenge-015-hard-0015",
  "title": "Sudoku Challenge 015",
  "description": "A hard Sudoku puzzle ready for online play, WebView embedding, and printing.",
  "difficulty": "hard",
  "seed": "playonepage-v1-en-sudoku-15",
  "sequence": 15,
  "tags": [
    "sudoku",
    "hard",
    "en"
  ],
  "audience": "All ages",
  "createdAt": "2026-05-30T00:00:00.000Z",
  "print": {
    "title": "Sudoku Challenge 015",
    "instructions": "Fill every empty cell so each row, column, and 2x2 box uses 1-4 once."
  },
  "routes": {
    "json": "/puzzles/v1/en/sudoku/en-sudoku-0015-1nlujr.json",
    "embed": "/embed/v1/en/sudoku/en-sudoku-0015-1nlujr.html",
    "web": "/puzzles/sudoku/sudoku-challenge-015-hard-0015/"
  },
  "puzzle": {
    "size": 4,
    "boxWidth": 2,
    "boxHeight": 2,
    "givens": [
      2,
      null,
      null,
      null,
      null,
      3,
      null,
      null,
      null,
      1,
      2,
      null,
      4,
      null,
      null,
      3
    ]
  },
  "solution": {
    "kind": "sudoku",
    "solutionGrid": [
      2,
      4,
      3,
      1,
      1,
      3,
      4,
      2,
      3,
      1,
      2,
      4,
      4,
      2,
      1,
      3
    ]
  },
  "estimatedMinutes": 5
}