This book is designed to teach people how to play intellectual games, because this book is the fruit of many years of work by the author of the book, Natalia Manusajyan, who created the Center for Intellectual Development for Children and Youth in Yerevan.  This center is called by the Latin word “Ludus”, which is translated into Russian very simply - game. Intellectual games teach you to think outside the box. Children and young people visiting Uentre are able to think in new ways!