Nikolaj points out that there’s a UEFI port of the game Tetris …but I can’t find the source, only the binary:
As mentioned in the below Defiant UEFI game engine post below, there’s a Tetris for UEFI on Github with source, unclear if this is a different one than above:
https://github.com/swmicro/Tetris
If someone has some spare time, please port MAME to UEFI. Please!
