81 NUMBERS SUDOKU BOARD – 9×9 grid with 3×3 regions, the most popular size is suitable for most Sudoku lovers. DOUBLE-SIDED RED & BLACK NUMBERS – Each tile has a red digital and a black digital on its both sides. At the beginning of the game, black numbers are used as givens. Usually black numbers are also used for your definite answers, and red numbers are used for your possible answers. BUILT-IN DRAWER FOR EASY STORAGE – All tiles and the solutions booklet can be stored to the the built-in drawer neatly so that they can be easily accessed and not easily lost. Includes 99 small tiles: 81 numbers for Sudoku game, 18 spare digits. PREMIUM SAFETY MATERIALS – Made with high-quality wood and eco-friendly paint, safe and durable. WELL DESIGNED FOR GIFTS & COMPETITIONS – Great design and well made, its a good choice for the sudoku competitions and also it can be used as a wonderful gift.