Secret Code Games for Clever Kids(r): More Than 100 Puzzles to Boost Your Brainpower - Gareth Moore

Critical Thinking Skills: Practical Tools for Rational Thinking and Deep Analysis to Boost Your Brainpower. Adopt Logic Strategies to Find Intel/Carl Patterson

Eat Complete: The 21 Nutrients That Fuel Brainpower, Boost Weight Loss, and Transform Your Health - Drew Ramsey

Ultimate IQ Tests: 1000 Practice Test Questions to Boost Your Brainpower, Hardcover/***

The New York Times Large-Print Spring Forward Crossword Puzzles: 150 Easy to Hard Puzzles to Boost Your Brainpower, Paperback/New York Times

Ultimate IQ Tests: 1000 Practice Test Questions to Boost Your Brainpower, Paperback/Philip Carter