The 15 Puzzle Book contains an illustrated history of one of the most popular and important mechanical puzzles of all time. It can be argued that the 15 Puzzle

No amateur or math authority can be without this ultimate compendium of classic puzzles, paradoxes, and puzzles from America's best-loved mathematical expert. 3

Slide and turn the tabs page after page to discover adorable animals. This learning technique stimulates the fine motor skills and cognitive abilities of toddle

This vibrant and charming puzzle book is packed with entertaining new takes on classic puzzles, lovable cartoon illustrations, and an irrepressible sense of fun