This document discusses game as a service (GaaS) models. It explains traditional boxed games versus free-to-play games and how the latter aim to bring users from open to closed markets by making the game launch just the beginning. It outlines monetization options for free-to-play like in-app purchases and subscriptions. It emphasizes the importance of player retention, challenge and reward, integrity, and long-term goals to keep players engaged over time through immediate, short-term, mid-term and long-term interactions. It also discusses content delivery through developers, chance/procedural generation, or player-generated means and the need for frequent updates and potential for growth to fill players' time.