Dr. Richard Bartle identified four different types of players: Achievers, Explorers, Killers, and Socializers. Each had their own styles of play and goals in the game. However, if you look at the games out there you won’t see many games that really appeal to all these types. Although Killers have gotten a bit of attention, the market belongs to the Achievers.
What about games and gameplay designed for the rest of the types?