A collection of games, tricks, and puzzles using mathematical concerns and knowledge.

The noted expert selects 70 of his favorite "short" puzzles, including such mind-bogglers as The Returning Explorer, The Mutilated Chessboard, Scrambled Box Top

Give your brain a workout on the type of brainteasers that challenge the best solvers at the World Puzzle Championships. They're tough, but fun, and the feeling

Selected brain teasers requiring geometric, algebraic, and logical solutions

Make math fun with amazing brain-teasing puzzles! Hours of enjoyment while developing critical thinking skills. Developing critical thinking skills has never be