The book contains a variety of intellectual games for the development of children of preschool and primary school age. All of them are accompanied by accessible explanations on the organization and methodology of their implementation and are equipped with didactic materials. Entertaining tasks, crosswords, puzzles help develop children's abilities, cognitive activity, logic of thinking, broaden their horizons, general awareness of the world around them, and are addressed to those who like to think , reason and fantasize. The material in the book can be used by preschool teachers, primary school teachers, methodologists, and organizers of children's leisure activities.