This challenging collection of over 100 puzzles, riddles and games will keep active minds engaged and engrossed for ages. Along with some intriguing and innovative lateral thinking puzzles and brain-racking riddles, the pack contains a variety of esoteric games designed to engage the most demanding mind. Included are lateral thinking games of great cunning, ancient games from China and Siam, and a host of original puzzles that will stretch ingenuity to the breaking point. Pentominoes, Jailbreak, chess problems and crosswords, matchstick and coin puzzles make this the perfect gift for myriad avid and impatient problem-solvers who have made the Mensa puzzle books such a hugely successful series worldwide.