MAP90: Marine Lemmings (Doom Arcade)

MAP90: Marine Lemmings is the third level of Doom Arcade, created and designed by Ethan Watson (GooberMan). Doom Arcade is what Doom would be on an arcade machine. Your playtime is counting down, and to extend it, you have to kill monsters. Other levels are MAP01: Hangar and MAP32: You Sunk My Battleship!.