Perfect for sudoku fans—the rules for these 100 logic puzzles are simple, and the math is easy. But the puzzles get harder and harder! Once you match wits wit

Race the clock to solve 70 fun puzzles with grade-school math—and genius logic! Welcome, brave math wizard, to the world of area mazes. These clever grids of

Forty mazes with geometric trickery.

Author and professional futurist Karl Schroeder, whose novels Ventus and Permanence have established him as a groundbreaking visionary in hard science fiction,

A colorful collection of the most difficult geometric based puzzles on the market, compiled by Mensa puzzle setters.