I don't think there are that many people out there that don't know of Doom, it's a very blood thirsty 1993 science fiction horror-themed game by id Software. In Doom, players assume the role of a space marine, who must fight his way through the hordes of invading demons from Hell. But along comes Prodeus, an awesome looking first person shooter which pushes the boundaries of the level of violence as a Doom inspiration that's available today on both GOG and Steam!