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Black Mirror III Hints
Metal box.
1 of 7: Darren figures there's some kind of memory aid around here for the metal box's combination. He's right, but it's well-hidden.
2 of 7: Notice that there's an old film projector on the dissecting table aimed at a projection screen on the wall.
3 of 7: Click on it to turn it on and verify it works (if you haven't already done so for another task), then look around for some film to use with it.
4 of 7: Use the film reel with the projector to get it inserted and ready to play.
5 of 7: Click on the projector to get a projector icon, then click it on the projection screen to get the projector's position adjusted. (Note that you may have to click twice.)
6 of 7: Once that's done, the projector puzzle screen will come up.