LKTris is a small game I developed for a university project
The game itself isn't any special. It's just a simple Tetris implementation
The interesting part is that this game was developed in pure C without any underlying operating system
I developed this for my smartphone 'Xiaomi MI2' and used the manufacturers bootloader as a code base.
This bootloader supports all I needed: Display, volume/power buttons and (optionally) thread support.