Pico-8 API Cheatsheet
iiviigames.github.io
iiviigames.github.io
Pico-8 [1] is a "fantasy console" - basically an emulator for gameboy-style portable game console but without the actual hardware.
The emulator itself is a paid product and it comes with tooling and documentation to create games ("cartridges"). You can find many of them on itch.io [2].
Similar, but no paid version at all, and you can write as much Python as you want.