Every one of the illustrated, full-color conundrums in this collection has been designed to train your mind . . . no matter how little spare time you have! The plethora of puzzles--more than 200--includes all the popular types: sudoku, logic sequences, riddles, Latin squares, visual teasers, and math challenges. As you work your way through, the problems grow from easy-peasy basic to medium difficulty. Who said exercise couldn't be fun?