Try Kakuro - the crossword puzzle of numbers! Using the digits 1-9, each horizontal and vertical block must add up to match its clue, but no digits can repeat. As addictive as Sudoku, but even more challenging! Contains 121 number tiles, two training puzzles, over 40 other puzzles and instructions. Ages 8 and up. Measurements: 10.5 Length/Inches, 10.5 Width/Inches Base Material: 100% Plastic Care: Wipe Clean Country of Origin: Made in US