Introduction, Part I: What Is Human Play? A Philosophical Issue, 1. Play as a Phenomenon and a Value, 2. Play, Game and Sport as a "Tricky Triad" in the Philosophy of Sport, Part II: How Humans Play: A Psychological Issue, 3. Cognition, Behaviour, and Activity in Games Playing Through a Complexity Prism, 4. Psychology of Play as Mental Escape, Part III: How Human Culture Plays Games: A Social-Anthropological and Historical Issue, 5. From Ritual to Sport Show, 6. From Games Playing to Games Teaching, Part IV: How to Teach and Coach Games: The Pedagogical Issue, 7. Complexity Paradigm in Games Teaching and Coaching, 8. The "8 & 4" Approach to Games Teaching and Coaching (I): Main Principles, 9. The "8 & 4" Approach to Games Teaching and Coaching (II): Basic Concepts