http://en.wikipedia.org/wiki/Bartle_Test The Bartle test divides game players into four camps: "Achievers" (Diamonds), "Explorers" (Spades), "Killers" (Clubs) and "Socials" (Hearts). Explorers love the experience of uncovering new areas, or new game mechanics. Killers are self-explanatory. They also enjoy competition in general, even if said competition doesn't include "slaughter". Socials... are self-explanatory. Achievers like to have things to show that they've earned them. Levels, obscure loot, notoriety... More detailed profiles in the wiki link.