22 Ku-du is the wood tile math crossword game that's fun for all ages! A great family game that is easily adaptable to all skill levels. Make all your rows and columns total 22. Practice basic math skills while you play. 108 all-wood tiles come in a zippered pouch for easy storage and travel. Many different variations are possible to enhance the game and match the players skill level. Best for ages 4 years and older.