Half Life 2 Meets Doom In This Spectacular Garry's Mod Add-On
DSOGaming writes: "Now this is simply amazing. YouTube’s GhorsHammer is creating an incredible add-on for Garry’s Mod called gmDoom. According to its description, gmDoom is a partial source port of Doom integrated into Garry’s Mod 13."
(Doom, Half-Life 2, PC)