Should the brain need additional stretching, older kids and brave adults can try The Big Book of Brain Games: 1,000 PlayThinks of Art, Mathematics, and Science. Author Ivan Moscovich, the best-selling puzzlemaster, delivers original and retooled classic challenges, puzzles, riddles and illusions in a wide range of categories. Ranked by difficulty and (thankfully) answered in the back of the book, anyone's perfect puzzle is just a page away.

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