Announcing the most compulsive, head-scratching, and - at 5.08 pounds - gargantuan puzzle book ever. An obsessive collection of 1,000 challenges, puzzles, riddles, illusions - both original as well as must-do classics - it's like salted peanuts for the brain. Jam-packed on the page and illustrated throughout in full-color, with a visual for each entry, the book, opened anywhere, is like a call to action. And once started it's hard to stop, because at the end of every successfully completed game the puzzle-solver feels smart, successful, and at one with the beauty of mathematics. PLAYTHINKS is the first and only book where science, math, and art puzzles all come together. Broken down by chapter, PLAYTHINKS challenges with 12 basic categories, including games of Geometry; Patterns; Numbers; Logic and Probability; and Perception.