This Casio Loopy Port of DOOM Can Print the Game Screen as a Sticker
Casio's 1995 Loopy game console includes a built-in thermal sticker printer for printing images from games. Throaty Mumbo's LoopyDOOM port makes that unusual hardware feature available to DOOM too: an option in the menu prints the current game frame.
DOOM itself runs on the real 16 MHz SH-1 hardware with roughly 512 KB of RAM at around 8–15 fps. Running DOOM on odd hardware is already a familiar challenge; this port goes a step further and treats the console's printer as a feature DOOM ought to support too.

Getting DOOM running was already enough, but then the port noticed the console had a printer and decided DOOM needed screenshot printing too.