A collection of over 500 challenging problems and puzzles that require either logical deduction or lateral, imaginative...more

Examining several of the world's greatest historical geniuses, this book concentrates on the common threads between...more

Are you a Super Brain, Mega Mind, or Maths Genius? This title helps you find out just how smart you really are. Packed...more

Presents a selection of more than 100 puzzles that train your brain.more

A collection with hundreds of problems - including wordplay, maths, analytic reasoning, logic, visual dilemmas, and...more

Suitable for those who want to take some serious mental exercise.more

First I must congratulate you on taking a positive step that will open new doors in your life. What you have before you...more