You can also find the same Easter egg in the Ghost Hideout when moving through the caves. Next to the door is a graffiti in red and white of the hellish face that looks exactly like the loading screen of the Hell Levels in Doom 3. Continue on your way and you will reach a room with a door that you have to go through to escape. You will go through an opening through the wall and down a flight of stairs until you reach a white sofa.
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Several boxes in the game are labelled "MIXOM: Model A-2515", e.g.A Doom Space Marine bobblehead can be found within the aforementioned secret room, similar to the unobtainable one seen in the Dan Hagar's Dune Buster during the Prologue after Dan saves the protagonist from two Ghosts.On the upper-left corner of the Doom door "E1M1" is written which is the internal label for "Hangar", the first level of Doom.
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There is the secret Doom room in RAGE that is located in the Gearhead Vault.For example, one could be seen on the Mayor Clayton's desk in Wellspring. The cups can be found throughout the Wasteland. The small object called "Black Coffee Mug" is emblazoned with a Doom 3 logo.In Wellspring, a man named Dallas can be found in the Second Chance bar, reading the Doom Comic (pages 6 and 2, specifically).While having the Rocket Launcher equipped and standing in one spot doing absolutely nothing for about five minutes, the targeting screen will flip down and a game of Doom will be playing.The fourth difficulty trophy, "RAGE Nightmare", references Doom's hardest difficulty, "Nightmare!". The Achievements/Trophies for completing RAGE on various difficulty levels, "Hey, not too rough", "Hurt me plenty" and "Ultra-violence", are references to the names of three difficulty settings available in Doom.