Cheats and Walkthroughs
id Software filled Rage with plenty of Easter Eggs paying homage to past games. One of Rage's Easter Eggs is nod to Wolfenstein 3D. The blue, polygonal level even has a gold trophy that can be sold for a pretty good price.
If you want to find the Wolfenstein 3D room head to the Ghost Hideout by the Hagar Territory. It has to be after your initial visit. I know that's vague but I'm trying to spare you spoilers. Watch the video to find out more.