To learn how things work in Xlib and XI2 programming, I’ve written a little game. You can attach multiple keyboards to one computer and then invite some friends over to see, who can type fastest. The code is really smelly because I did this only for learning purpose. If you like it, feel free to make the code and/or the game better (like bigger font size or more player support or something).

You can get the code on github.

screenshot of the player setup

screenshot of the player setup

ingame screenshot

ingame screenshot

UPDATE: The code is ported to Qt (better font rendering, fullscreen…) and can be found here: https://www.ralfj.de/git/multypo.git. Qt does not support distinguishing key presses between different keyboards, so the event handling code is still X specific.