I made a game in assembly that runs without an operating system. This is bare metal programming.
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What's possible with UEFI? Graphics, input, output. It's everything you need to make a game (except for sound). Using x64 assembly I recreated Zaxxon as a UEFI application that runs without the support of an operating system. This program will run on any x86_64 machine. Check it out via the link down below.

Open Source Project on GitHub:
https://github.com/InkboxSoftware/spa...

UEFI spec: https://uefi.org/specifications
EFI Toolkit repo (if you want C): EFI toolkit repo https://github.com/tianocore/tianocor...