Marathon: Infested is a Marathon project based on the game by Bungie Software.

While there is no single-player story story, there are numerous game types from the original series to play offline, and online, including a new one, ÒSurvivalÓ, where the player fights either solo or coop, against waves of monsters. Multiplayer game types can be played either LAN, online, or offline, with other players, or bots.

Marathon: Infested is built from the ground up in full 3D using the Dimension 3 Game Engine, by Klink Software.