Sudoku is played on a grid divided into 9 large squares (3x3), with each square made up of 9 cells (3x) for a total of 81 cells.The objects of Sudoku is to fill in a (9x9) grid in such way that every row, column and (3x3) square contain each number from 1 to 9 once, and only once.In this game, the rules book show about 150 grids and their solutions.45 Easy grids 45 Intermediate grids 45 Difficult grids 15 Evil gridsLike you'll see in the game material, you game play with the tiles or by writing directly on the board.Game material :1 dry-erase game board 90 number tiles 1 black dry-erase marker 1 red dry-erase marker 1 game rules and grids bookletThis game can be played alone or in group. - BoardGameGeek