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On November 13., Nintendo launched its newest retro console, the Nintendo Game and Watch - but by then it was already hacked! In contrast to the other Nintendo classic consoles (NES & SNES), Nintendo upped their game this time: A locked processor, AES-CTR encrypted flash & co. made it significantly harder to hack it, but in the end it was still hacked - one day before release. This talk walks through the whole process of opening it up, exploiting the firmware up to bringing homebrew to a new console - in a fun, beginner friendly way. The Nintendo Game & Watch was anticipated by a lot of retro-interested folks, and the clear expectation was: We wan't to get more games onto this device! But Nintendo made the life of hackers harder: The CPU is locked, the external flash AES encrypted, and the USB-C connector does not have its data-lines connected. But not so fast! In this talk we learn how to exploit the firmware, get code-execution via a NOP-slide, dump the ROMs & RAMs of the device and achieve what everyone has been asking for: DOOM running on the Nintendo Game & Watch. If you are interested in the full flow from opening up a device, exploiting it, to writing custom drivers for homebrew, this is your talk! And all you need to follow along are a Game & Watch and about $4 of equipment! about this event: https://fahrplan.events.ccc.de/rc3/2020/Fahrplan/events/11527.html