This book presents the best problems that stimulate the development of logic. Tasks for cutting and rearrangement, "magic" squares and spatial riddles, exercises for attentiveness and ingenuity, puzzles from matches and questions for ingenuity - all this and many other tasks that contribute to the development of mathematical, volumetric-spatial, intuitive and other types of thinking, the reader will find on the pages of this wonderful publication. The book will be useful to all lovers of mathematics, regardless of age.