Classifying game mechanics and types of play
- “Hearts, Clubs, Diamonds, Spades: Players Who suit MUDs”, Richard Bartle1996
- “GNS (Gamism, Narrativism, Simulationism) theory”—a theory developed by Ron Edwards
- “MDA: A Formal Approach to Game Design and Game Research” (PDF), Robin Hunicke, Marc LeBlanc, Robert Zubek2004. Explains the 8 kinds of fun.
- “Game Mechanics Taxonomy”, Henri Tuhola2015