Start the movie set level as shown in the video, for speed purposes I've used the cheat menu but you don't have to, you can just play the level.
From the start, Press D-Pad down, X, Right stick click in and then D-Pad right to access cheat menu, select no clip to walk through walls.
Follow my route as shown, turn off no clip and then enter secret level, its not that tough, you can enable God Mode if you really want to, upon completion you will earn the achievement or trophy 'I never knew this was here'
Enjoy !
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