Contains 90 brilliant, ten-minute puzzles, to help train your brain. The wide variety of timed puzzles and exercises will keep you guessing and give your brain

A brain-teasing collection of mental workouts, designed to be solved in 10 minutes. Puzzlers of all skill levels: challenge yourself to tests of word and langua

A brain-teasing collection of mental workouts, designed to be solved in 10 minutes. Puzzlers of all skill levels: challenge yourself to tests of logic and reaso

A brain-teasing collection of mental workouts, each designed to be solved in 10 minutes. Puzzlers of all skill levels: challenge yourself with over 150 tests of

A brain-teasing collection of mental workouts, each designed to be solved in 10 minutes. Puzzlers of all skill levels: challenge yourself with over 150 tests of