Wolfenstein II: The New Colossus has a fully playable reskinned version of 1993's Wolfenstein 3D. “Wolfstone” can be found on the resistance U-boat and it’s a ton of fun. You can watch me play some in the video above.
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Be warned: Once you start it, you can’t exit back to New Colossus. You either have to die on purpose, or beat the whole thing.