Eye tricking, mind mangling, brain bashing puzzles, tricks and visual oddities. In order to solve the 500 fantastic optical illusions in this stupendous collection, you'll need to train your brain to see and think differently. That's because these amazing puzzles are not exactly what they appear to be, from fantastic hidden objects to astonishing mazes. But don't worry, there's an answer key in the back. Paperback, by Keith Kay and the Diagram Group, Sterling publishing.