While the original Marathon is out now on Steam, sequels Marathon 2: Durandal and Marathon Infinity will be added at a later date. It is worth noting that these are modified versions of the original games, with painstaking work taken on by the Aleph One community to ensure that the game runs properly on modern systems.

The Marathon trilogy was a series of classic shooters made exclusively for Macintosh computers of the time. Since then, the three games have gotten a cult following, thanks in large part to how many of the seeds for storylines that take place in Halo were originally planted in the Marathon games.

Plans to release Marathon on Steam were first announced back in March. The Aleph One version of Marathon features several improvements over the original game, including support for 60+ FPS, and even a HUD.

https://twitter.com/Bungie/status/1788955765710983655

Of course, this isn’t the same version from 1994, but Aleph One. It’s an open-source version of the title that fans have supported over the years. Available under the GNU General Public License, it’s the same game as the original but with widescreen HUD support, 60+ FPS interpolation, positional audio and even a 3D perspective and filtering.

Marathon is considered a classic among old-school Bungie fans, which showcases several ideas that would eventually influence the Halo series. Classic Marathon doesn’t have a release window on Steam, and there’s no word on whether Marathon 2: Durandal and Marathon: Infinity are also coming. Stay tuned for updates in the meantime.