The book includes about 800 problems in stereometry, provided with detailed solutions. Most of the tasks are related to the school curriculum .. Their difficulty level is mostly somewhat higher than normal school tasks, and there are also some very difficult tasks designed for students in math classes. Tasks are broken down into cycles related to the overall idea of the solution. Within each cycle, problems are arranged in order of increasing difficulty. Such a partition will help the reader to navigate in a large set of tasks and give him the opportunity to understand directly in the topic that interested him, not reading the whole book in a row. For schoolchildren, teachers of mathematics, heads of mathematical circles, students of pedagogical institutes and universities .