Christmas is coming again, and generally that means christmas trees and everything in it: lights, streamers, and ofcourse baubles. The holiday is all very jolly and everything, so I decided it was lacking some doom... errm, I mean Doom. So I 3d-printed a small Christmas bauble modeled on an IBM PC, stuffed it with the tiniest LCD I could find, added a processor and the logic to make it work as well as a battery. This thing can hang in your Christmas tree and show the Doom demo mode, including the audio effects and the sound track. And best of all: if you pair a random BLE keyboard or joystick to it, you can play and kill millimeter-sized zombies, shotgun guys and imps.

Read on for the details on how I made this.

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