Before there was Halo and Destiny, there was Marathon — and now Steam users can check out the classic sci-fi shooter for themselves. Bungie just announced that the first game in the original trilogy has surprise-dropped on Steam, and it’s available on both Mac and PC. Even better, you can play it for free.
The game is actually credited to Aleph One Developers, which is described as an “open source continuation of Bungie’s Marathon 2 game engine.” In fact, the group has already…
