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• 81 thinking pieces. The best way to train brain.
• 9×9 grid with 3×3 regions; 4×4 grids with 2×2 regions; 6×6 grid with 2×3 regions;
• The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9;
• 6×6 playing board uses the numbers 1 through 6; 4×4 playing board uses the numbers 1 through 4;
• The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a single solution. Comes with booklet of 320 sudoku puzzles at 3 levels of difficulty.