The books in this series aim to fill children's free time pleasantly. Each double page contains original and fun activities for endless hours of creative engagement.

Among other things, they include:

• logic games
• knowledge tests
• visual perception exercises
• mazes
• patterns
• puzzles
• magic and number squares
• riddles

With these activities, the child:

• absorbs the knowledge they have already acquired
• master new knowledge
• practices memory and observation skills
• sharpens their visual perception, imagination, and curiosity
• cultivates their creativity
• learns to make logical and mathematical reasoning, process, and formulate conclusions

At the end of the books, there are detailed answers so that the child is left with no questions or doubts.