Marathon 2: Durandal was the first sequel in the Marathon series of science fiction first-person shooter computer games from Bungie Software. It was released on November 24, 1995. The game is mostly set on the fictional planet of Lh'owon, homeworld of the S'pht, and once again the player takes the role of a Security Officer from the Marathon.

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Marathon 2 takes place seventeen years after the events of the first game. Durandal, one of the three AIs from the Marathon, sends the player and an army of ex-colonists to search the ruins of Lh'owon, the S'pht home-world. He does not mention what exactly he is looking for, although he does let it slip that the Pfhor are planning to attack Earth, and that being on Lh'owon may stall their advance.

Xbox Live Arcade version A port of Marathon 2 to the Xbox Live Arcade was announced at the 2007 E3 Conference by Microsoft. The Xbox Live Arcade version of the game was developed by Freeverse Software, and presents a revised HUD and provides support for both 4-player split screen play on the same console and 8-player Xbox Live gameplay. Since the old Marathon network code could not handle reliable internet play, the ReplicaNet middleware was used which also allowed coop play with up to eight players. The game also supports 16:9 screen resolutions, high-definition output at 60 frames per second (compared to the original 30) as well as upgraded models and graphics, support for 8-player co-op mode over Xbox Live, several international versions, and a new game mode called "Survival" where the player is given a large amount of weapons and ammo and must defeat endless waves of enemies, earning points for effectiveness and taking minimal damage, with high scores shared over Xbox Live. The only feature from the original game not present is the ability to save films, due to limits on user storage provided by Xbox Live and a bug caused by lag. The game costs 800 Microsoft Points (US$10), requires 138.5 MB of storage space,and was released on August 1, 2007. Mark Levin of Freeverse noted in a postmortem of the port that "Overhauling systems not suitable for use on a different platform can involve a great deal of work, and console platforms with certification processes may require the creation of large swaths of brand-new code and content" but they still continued working on the port because "a port is a chance for an old game to have another chance at entertaining a new audience."

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