Beat this: children must find up to 100 differences in each "odd one out" puzzle in record time! It's not easy to solve them--but it's such a thrill, kids will

"There is mental entertainment, magic, math, and more in this collection of classic tricks and problems."-Student Library Journal. Although referring to Townsen

A collection of seventy illustrated logic puzzles set in fantastic locales such as outer space or mythical kingdoms, with explanations of the logical reasoning

The noted expert selects 70 of his favorite "short" puzzles, including such mind-bogglers as The Returning Explorer, The Mutilated Chessboard, Scrambled Box Top