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If you wait 5 minutes with a rocket launcher, the weapon's video display will pop out and a video of the original Doom will start playing.
Contributed by pAroxizm
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On the desk of the mayor of Wellsping's office is a Vault Tec Bobble head from Fallout 3.
Contributed by Funland47
There are 4 secret rooms hidden throughout the game. These rooms reference the developers id., Doom, Quake and Wolfenstein.
Contributed by Funland47