the difficulty level and the speed at which the level is completed, provide multipliers to the total score. Players are awarded gamerscore points for unlocking Achievements by reaching a certain score in each level. Local area network or Xbox Live supports up to sixteen players in multiplayer matches, with game modes including variations of deathmatch and Capture the Flag. Players must actively seek out other players through their Xbox Live Friends list, using the party invite system, or the LAN search feature to play multiplayer matches with their own custom rules and customized maps. If they are connected to Xbox Live however, a player can choose to have the game decide for them the exact rules and map to play on, as well as finding additional people to play against or with, using the "Matchmaking" system (the automated grouping of players of similar skill). A player will decide from a selection of developer designed "playlists" which each contain a certain way to experience the game. Like other multiplayer Xbox 360 titles, Halo 3 uses a customized version of TrueSkill ranking system for its matchmaking on a per-playlist basis. A linear measure of a player's experience with the matchmade portion of the game and each particular playlist is also tracked (denoted as EXP). To help players have an enjoyable time online, several peace-of-mind features are implemented within easy reach, such as avoid/feedback options on a player's service record, as well as voice chat mute straight from the in-game scoreboard. Like Halo 2, Halo 3 supports downloadable content and updates. The online services for the original Xbox 360 version of the game went offline in January 2022. Synopsis Setting and characters Halo 3 is set in a science fiction setting during the years 2552 and 2553. Humanity is at war with a genocidal alliance of alien races known as the Covenant. After years of conflict, a Covenant fleet discovers Earth during Halo 2. "Halos" are massive ringworlds, ranging from thousands to tens of thousands of kilometers in diameter, scattered across the galaxy. These rings were constructed thousands of years ago by a race known as the Forerunners as weapons of last resort against the parasitic alien species known as the Flood. When activated, the Halos would destroy all sentient life in the galaxy, depriving the Flood of its food. The Forerunners disappeared after they activated the rings. In Halo: Combat Evolved, whilst