Bungie's first real shooter hit, Marathon, has been released on Steam for modern hardware as Classic Marathon, a fan-led port that has Bungie's blessing to release. Classic Marathon is completely free, letting you have the rare experience of playing a classic game not only easily but with zero time spent hunting down an old copy and fighting with compatibility.
Marathon is a sci-fi FPS where your character is in charge of fighting alien forces that have boarded a human colony ship in the distant Tau Ceti system. Your job is to defend the ship and the crow of the Marathon, but discord among the artificial intelligences that run the ship and factionalism among the alien attackers become the key points of the plot.
