Sudoku is a great road-trip game that really gives the old noggin a mathematical workout. Zip ours up in its handy magnetic tin when you need to take a break, and the game pieces will be right where you left them when you resume play. Game includes kids' sudoku puzzle booklet with over 50 simplified starting setups and their solutions, game pieces and instructions. Tin opens flat for playing surface. Size is 5.25''w x 5.25''h x 1''d. WARNING: Choking Hazard - small parts. Not for children under 3 yrs.