This book provides a collection of problematic situations of different kinds, with a mathematical background, presented as a game for children and adolescents of school age, adults and seniors, to share as a family. For its resolution, it is required to appeal to common sense, ingenuity and creativity. It is highlighted that the answers present explanations of different resolution strategies applicable to other situations. Professionals from different areas of health and education agree on the beneficial effects that brain games have on intellectual performance and brain activity; his habitual practice improves memory, deductive logic, spatial perception and mental agility.