The book by the master of Russian Popcornular science literature Boris Anastasyevich Kordemsky is a collection of mathematical miniatures: various entertaining problems, mathematical games, puzzles, trick jokes. It has been published several times both in our country and abroad. For many years it has been and remains a reference book for many generations of teachers and students. Anyone who is fond of mathematics, regardless of age, will have the opportunity to train thinking, resourcefulness and ingenuity. At the end of the book are given answers and detailed solutions to all problems.