The book is largely similar to the popular books "Entertaining Physics" by Y.I. Perelman, "Mathematical Wonders and Secrets" by M. Gardner, "In the Kingdom of Ingenuity" by B.I. Ignatiev, "Mathematical Ingenuity" by B.A. Kordemsky and others. It contains a large number of various entertaining logical problems and puzzles, interesting facts and useful programs, the simplest computer games, tricks, etc.