This document summarizes some sessions from the 2019 GDC conference about making games fun and encouraging player engagement. It discusses play mechanics, role-playing in games, communication features, and using analytics from games like Call of Duty. One talk was about interactive worlds at Disney and bringing environments to life. Another discussed building an AI chatbot for players to have conversations with. Throughout the document it reflects on how to design games to be fun by allowing exploration, creation, role-playing and other engaging activities.