Mensa® Presents: The Big Book of Brain Benders: 200 Puzzles and Riddles from The Smartest Brand in the World (Improve Your Memory, Concentration, Creativity, Reasoning, Problem-Solving) | Indigo
Mensa Brain Training
Mensa® Mind Benders: 100 Logic Games and Puzzles to Improve Your Memory, Exercise Your Brain, and Keep Your Mind Sharp (Mensa's Brilliant Brain Workouts)