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

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! Hooked on area mazes? Y

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

Containing 36 designs inspired by the mystical mandala, this book offers an unusual and challenging array of mazes. Not too easy but not too hard, they're perfe

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