There’s a Github project with a UEFI maze game on it, called Firmware-Maze:
https://github.com/liute62/Firmware-Maze
Appears to be mostly a single-file game:
https://github.com/liute62/Firmware-Maze/blob/master/src/final3.c
I’ve not built it yet, I’ll try that later, I still have to read CodeRush’s latest UEFI SecureBoot tutorial…
Some other UEFI games:
