Wolfenstein: The New Order is quickly becoming one of our favorite single-player games of the year. The game play is fun, the story is top notch and the voice acting is second to none. If all of that wasn't enough, you can now jump into a fun Easter egg side mission, Escape from Castle Wolfenstein.

If you want to experience this for yourself, wait until one of several chapters where you're hanging out at the Resistance Headquarters. Head all the way up to the top level of the compound and into the far corner of the room. You'll see a mattress on the ground with some bottles next to it. When you move a little closer, you'll have the option to sleep, with the title Nightmare! next to the bed. Press the button indicated to jump into the side mission.

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If you want to see how to unlock it for yourself, or just take a quick look at the Easter egg in action, click on the video below.