Discover the adventure and excitement of mathematical puzzles. Match your wits with the human computer. Sharpen your intellect, delight your friends and enjoy h

Here are over 300 tantalizing puzzles, brain teasers and riddles by one of the greatest mathematical geniuses of the twentieth century, Shakuntala Devi, popular

A collection of logical, spatial-visual, and math puzzles that are designed to give the brain a workout.

Thomas the Tank Engine, James, and everyone's favorite Thomas & Friends characters are featured in five different puzzles in this oversized padded book. Each fu