This is a skill building game that will challenge your child. It is a simple game to play, but difficult to master. Children will develop logic and reasoning while having fun. Select one of the fifty puzzles from the enclosed booklet and place the number tiles, red side up, on the game board. To solve the puzzle, fill in each square on the grid with a black number tile so that every row, every column and every 3x3 grid contains the digits one through nine. This game includes a molded 3-D game board grid, 81 double-sided number tiles (black and red), a handy tile storage compartment and a booklet featuring 50 puzzles. The tiles store conveniently inside the board for on the go fun.