are especially keen at sharing their gaming experiences on forums and social media. For instance, the procedurally generated game Dwarf Fortress, has a tight-knit community due to the game's unforgiving nature, unique scenarios and perplexing mechanics. Video game streamers who interact with their audience are often socializers. One former popular form of gaming video is the Let's Play format, which has largely been replaced by live streaming on platforms such as Twitch and YouTube. Multi-player appeal to the Socializer The online environment is very appealing to the Socializer, as it provides near limitless potential for new relationships. They take full advantage of the ability to join guilds or kinships in many online games. Killers Single-player appeal to the Killer Killers are, more than other player types, motivated by powergaming and eclipsing others. They want to achieve first rank on the high score board or beat another speedrunners time record. Multi-player appeal to the Killer Causing mayhem among computer-controlled people and things may be fun to the Killer, but nothing amounts to the joy of pitting one's skills against an actual player-controlled opponent. For most, the joy of being a Killer results from a friendly competitive spirit. For others, it's more about power and the ability to hurt others or the thrill of the hunt. One such example is "ganking" or "owning", a process where the Killer takes their strong character to a place where inexperienced or weaker characters reside, and proceeds to kill them repeatedly. Application In addition to helping players define their game-playing preferences, the Bartle taxonomy has also been used by game designers to help define the requirements of games that are intended to appeal to a particular audience. History In 2006, after running for ten years on a web server maintained by Erwin Andreasen, the database met with intractable scalability problems. After several months, the test was rewritten and moved to GamerDNA servers, preserving all the original test data. Expanded categories Richard Bartle also created a version of his player types model that included a third axis of implicit/explicit, leading to eight player types. Achievers Planner (explicit) They set a goal and aim to achieve it. Opportunist (implicit) They look around for things to do, but they don't know what these are until they find them. Explorers Scientist (explicit) They are methodical in their acquisition of knowledge. Hacker (implicit) They have an intuitive understanding of the virtual