Mensa - Riddles & Conundrums: Over 100 visual, logic and number puzzles by Robert Allen
Riddles and Conundrums is a fiendish, unstructured collection of riddles, lateral thinking problems, conundrums, mind mazes, posers and baffling brain twisters. Dip in anytime and solve a puzzle or two, or work your way through over 100 games and puzzles to strengthen your brain power.