Smart, addictive, challenging, fun, and good for the brain—here, in the irresistible 4" x 6" games format, are more than 450 truly satisfying, mind-expanding,

A pocket-sized brain gym! Mental games, visual conundrums, logic posers, riddles, illusions—in all, over 500 dazzling, full-color puzzles designed to stretch

Grab a pencil and get ready to become a problem-solving superstar with activities, puzzles, and games that will give your brain a serious boost. Master mystifyi

Puzzle lovers, rejoice! Bestselling math writer Alex Bellos has a challenge for you: 125 of the world’s best brainteasers from the last two millennia. Armed w

What's challenging, fun, and sure to give your brain a workout? This riddle book for kids ages 9-12! Riddle me this—can you solve these super hard word puzzle