card drawn from a deck of cards. Such "storytelling" games are instead simplified or streamlined forms of traditional role-playing games. Conversely, most modern role-playing games encourage gamemasters to ignore their gaming systems if it makes for a more enjoyable story, even though they may not describe themselves as "storytelling" games. A growing number of websites utilize a bulletin board system, in which the gaming is akin to Collaborative Fiction but known as a "Literary Role-Playing Game". The players contribute to an ongoing story with defined parameters but no narrator or directing force. A 'moderator' may oversee the gamers to ensure that the rules, guidelines and parameters of the gaming "world" are being upheld, but otherwise the writers are free to interact as players in an improvisational play. Many of these "Literary RPGs" are fan-fiction based, such as (most prevalently) Tolkien's Middle-earth, Star Wars, Harry Potter, Twilight, any number of anime and manga sources, or they are simply based in thematic worlds such as the mythologies of Ancient Greece, fairy tales, the Renaissance or science fiction. Most often referred to as "Literary RPGs" and place a greater emphasis on writing skill and storytelling ability than on any sense of competition driven outcome. White Wolf Game Studio's Storyteller System, which is used in World of Darkness role-playing games such as Vampire: The Masquerade and live-action games under the Mind's Eye Theatre imprint, is the best-known and most popular role-playing game described as a "storytelling game". Alternate form role-playing games An early design of a collaborative storytelling game not based in simulation was created by Chris Engle c. 1988 with his Matrix Game. In this system, a referee decides the likeliness of the facts proposed by the players, and those facts happen or are rejected according with a dice roll. Players can propose counter-arguments that are resolved in a dice rolling contest. A conflict round can follow to resolve any inconsistencies or further detail new plot points. Matrix Games are now presented in a board game format. In 1999, game designer Ian Millington developed an early work called Ergo which established the basis for collaborative role-playing. It was designed with the rules of the Fudge universal role-playing system in mind but added modifications necessary to get rid of the need for a gamemaster, distributing the responsibility for the game and story equally among all players and undoing the equivalence between player and character.