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NeoGAFs Kent Brockman

See Doom Running on Something Smaller Than a Credit Card
To say that Doom has been ported to just about every electronic device would be pretty accurate, and this latest video shows one more example.

In a video uploaded to YouTube a few days ago, the channel Adafruit Industries has shown that it's possible to play 1993's Doom on a computer chip board, in this case a System-in-Package module, that's about the size of, if not smaller than, a credit card. The short footage shows that the game runs perfectly through a 1.3-inch TFT display running at a resolution of 240x240. The controls comprise a series of basic switches directly on the board, and they've even managed to implement a headphone jack, so anyone playing can still get sound.
There have been many unusual devices that Doom has been ported to, but this version, nicknamed "PINKY" is probably one of the smallest machines that runs the game. An additional blog post from the creator explains that this iteration of the game being run on the ESP32 Pico device is called "PrBoom" which is described as a "minimal version" of Doom. User DESK OF LADYADA, who initiated the port, says that the screen is probably the smallest that can be used in this instance that still has "pixel perfect" emulation.