First Mensa Puzzle Book
As the name suggests, this book is designed and written to help you discover and sharpen your puzzle solving skills. As you go along this mental obstacle course, you will encounter and overcome Noughts and Crosses, Magic Squares, Alphametics, Letter Mazes, Cryptophones, Rebuses and over 130 other hair-tearing puzzles. And in case you find some of the puzzles on the easier side, (which is not likely, unless you are a potential Mensa member) you can even select the degree of difficulty you want to tackle. All puzzles are graded from moderate to difficult - with answers given at the back of the book.
Authors: Philip J Carter, Ken Russell