IQ Challenge: Over 500 perplexing number, letter & visual puzzles

IQ Challenge is a fun way of boosting your brainpower. Organized into sections, and comprising a more and more challenging array of puzzles and problems, it will give all aspects of your intelligence a rigorous workout. Cover Back Cover Title Introduction Reference sheet Puzzles Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10 Level 11 Level 12 Level 13 Level 14 Level 15 Level 16 Level 17 Level 18 Level 19 Level 20 Solutions Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10 Level 11 Level 12 Level 13 Level 14 Level 15 Level 16 Level 17 Level 18 Level 19 Level 20 Over 500 logic puzzles, mind-benders and mathematical teasers compiled into twenty levels of ascending difficulty.