Once in childhood, my friends and I built structures from tables, chairs, tablecloths and fabrics, and declared these structures our children's territory. Parents watched favorably and accepted our children's creativity. Having grown up, we began to build huts in the forest, lighting fires, creating friendly alliances, agreeing on our own unshakable, as it seemed to us then, rules of the game. The world has grown, but the games have remained, although most people think that this is not so. The cover drawing was created by the artist Alesya Evgenievna Reznikova, Belarus, Gomel, based on the computer game Assassin's Creed: Brotherhood.