- The main article for this category is Doom RPG.
“The Doom RPG is a game developed for cellphones set in the Doom universe. The game was developed...Doom RPG
“The Mars Incident were various incursions leading up to a large scale demonic invasion of Mars...Mars Incident
“To access the cheats in Doom RPG, go to the in-game menu and type "3666". This brings up the...Doom RPG cheat codes
“New Vegas is a popular vacation destination. It's unknown if its on Earth or possibly on Mars.New Vegas
This category has the following 8 subcategories, out of 8 total.