Roman Republic Games are community-based challenges where multiple players all play the same character (or set of characters) with some common objective, which may or may not simply be completion of the game. The concept was first envisioned] by Silfirwho wanted to have a game in which victory or defeat would be determined by the involvement of the entire community, with each player contributing an individual effort. In this classic style of Roman Republic Game, each player would play the shared PC for a fixed period of turns (typically around 2000) before the savegame is transferred to the next player in the roster. Death of the PC, in these cases, typically results in a death for all players, and means that the group must reroll from scratch. In more recent incarnations, particularly in Competitive games, the death of one PC may only result in the elimination of the player from the game. All such games typically are played over a period of several weeks to allow for varying schedules between players.
The first successful Roman Republic challenge was completed by the PC Rhea, the grey elven merchant (reports, char dumps), who successfully closed the gate after approximately 41 sets of 2000 turn rounds distributed over around 10 players. Numerous other Roman Republic characters following this format have been attempted, with more limited success.
More recent incarnations of Roman Republic games have added a competitive aspect. The popular The Weakest Link games of 2008  and 2009 divided players into small groups all playing the same PC, who would then dive into the ID for periods of 2000 turns, subject to the restriction that the player must descend at least once turn 2000 turn period. Players who died were eliminated from play, and the next player in the roster was regenerated from the most recent save file, until only one player remained. Because players were competing directly against each other on the same character, players often tried to place the PC in challenging situations in hopes of killing future players. Such behaviour was generally tolerated (in 2009, each player was allowed 2 turns of "friendly" play before aggressive play was strictly allowed), subject to the provision that if the player placed the entire group into a situation where no player could survive, then it would result in the elimination of the player who generated the situation. Previously slain players were also allowed to attempt these "impossible" situations, and, if they could survive, would be reanimated and allowed to continue play. One such situation arose each year, the Trial of Rust , where a PC with limited resources needed to pass a large threat room of rust monsters, and the Trial of the Dark Orc Tribe, where a PC faced a similar situation except that the tension room was full of dark orcs. Despite many attempts, the Trial of Rust remains impassable to this day; however, a very challenging but tractable solution to the Trial of the Dark Orc Tribe was demonstrated by several players. The 2008 challenge was won by PeanutGod, and the 2009 challenge was won by meh. The 2009 Weakest Link challenge also featured the introduction of play on jaakkos server, and the best turnout of any challenge game to date, with over 40 participants.
Similar challenges include the more recent Mission ADOMPossible challenge, which featured teams of 5 players with 5 characters attempting to complete various missions (eg. dive through the Unremarkable Dungeon, acquire the Fire Orb, etc.) and receiving points for their team for each completed mission. Players would swap characters upon completion of their mission. If a player died, that player and their PC would be eliminated from play, and the remaining members of the team would continue on without their assistanceThis format was designed to try to allow newer players more opportunity to participate--classes were distributed according to a list of preferences by each team captain, so each team ended up with several classes of relatively easy difficulty that could be given to less experienced players, whereas more difficult classes could be taken by more experienced players.