The book is mainly based on the materials of the regional youth newspaper Komsomolets, the newspaper Volga-Don; part of the tasks and puzzles is taken from the collections "Five Minutes to Think," "During Leisure Hours," from the book by Y.I. Perelman "Living Mathematics," the magazines "Technique - Youth," "Knowledge - Power" and others, the collection also includes the game "Tangram," proposed by S.I. Bessonov.