Andux Sudoku Board Box 3-in-1 Toy SD-03 (Blue)

81 thinking pieces. The best way to train brain.
*9¡Á9 grid with 3¡Á3 regions; 4¡Á4 grids with 2¡Á2 regions; 6¡Á6 grid with 2¡Á3 regions;
*The objective is to fill a 9¡Á9 grid with digits so that each column, each row, and each of the nine 3¡Á3 subgrids that compose the grid (also called "boxes", "blocks", "regions", or "subsquares") contains all of the digits from 1 to 9;
*6¡Á6 playing board uses the numbers 1 through 6; 4¡Á4 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.