When I think of FPS royalty, a few videogames spring to mind. Doom. Quake. Half-Life. Wolfenstein. GoldenEye. We wouldn’t have the powerhouses of Call of Duty, Counter-Strike, and the overlooked Titanfall 2 without these classics. The same goes for Bungie’s Halo, and while the studio has moved onto the greener pastures of Destiny, Marathon still stands tall as an iconic sci-fi classic. No, I’m not talking about Bungie’s upcoming PvP reimagining, but the classic ‘90s trilogy. It’s a shooter all FPS fans need to play, and the second game in the series just came to Steam for free.

MORE FROM PCGAMESN: Best FPS games , Marathon release date speculation, All Destiny 2 news