The most important thing for any child is the game! Role-based or educational, mobile and noisy or calm, with an adult, peer or alone, with a designer, dolls or ... a pan! Children should play always, everywhere and under any circumstances! It is in the game that the child receives basic knowledge about the world and its structure, about the properties of nature and the features of social interaction, and even about himself. In general, about everything in the world! Therefore, any developing notebook or book is, first of all, a manual on the game. And we tried to make the series of “10 most important children's affairs” close and necessary for each kid, able to captivate, amuse, teach.