This is an unusual book. For the first time in such a number, it contains fascinating games, original tasks, puzzles, ingenuity, crosswords, puzzles in mathematics and the Russian language, astronomy and history, chemistry and zoology, geography and music, botany and literature. The proposed system of classes will make it possible to successfully solve the problems of developing attention, memory, imagination, speed of reaction, arouse interest in the very process of cognition in both children and adults. The book can be read in the evening by the whole family, on the train on the way to the dacha, on the bus, returning from work, you can take it with you on a fishing trip, to the clinic - wherever there is a free minute or you need to pass the time.