Wolfenstein 3D Nightmare Level
Meet Anya in Chapter 4 at the Resistance secret base. Then after the helicopter theft go to the top floor and search for a room which has an old mattress on the floor next to the window. Focus on the mattress to bring up the option to enter a 'Nightmare'. Enter the 'Nightmare' to find yourself in the very first level of Wolfenstein 3D.
More tricks, tips and cheats for this game are right here - Wolfenstein: The New Order cheats
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