{
  "id": "classic",
  "name": "Classic Sudoku",
  "rules": {
    "4x4": "Place a digit from 1 to 4 into each empty cell in the grid so that each digit appears exactly once in each row, column and 2x2 outlined box.",
    "6x6": "Place a digit from 1 to 6 into each empty cell in the grid so that each digit appears exactly once in each row, column and 2x3 outlined box.",
    "8x8": "Place a digit from 1 to 8 into each empty cell in the grid so that each digit appears exactly once in each row, column and 2x4 outlined box.",
    "9x9": "Place a digit from 1 to 9 into each empty cell in the grid so that each digit appears exactly once in each row, column and 3x3 outlined box."
  },
  "tags": ["classic"]
}