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.