M. : Knowledge, 1990. - 144 s. - ISBN 5-07-000097-7 . Puzzles refer to cognitive games. Classes with them are taught to think logically, develop spatial imagination, train memory. They happily combine mental work and play, teaching and entertainment .. The central question addressed in the book is: "How to learn to solve puzzles?". The connection of logical games, such as the Rubik's Cube, with the areas of serious mathematics - combinatorics and algebra is shown The book is designed for the widest range of readers - adults and children, parents, teachers, all fans of games and puzzles .