Test your cerebral mettle! 250 challenging puzzlers, divided into twenty-five 90-minute "laps," are coded for difficulty (hard to hardest). Reckon with five different types of obstacles as — Make a mental leap over verbal hurdles — Run circles around mathematical mind joggers — Plunge into the depths of spatial relationships — Flaunt your technological prowess Flex your mental muscles with lateral thinking puzzles. Answers provided. Black-and-white illustrations

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