"Quake" game. KolibriOS distribution does not contain it. Port of the game can be found here, also you will need pak-file from the original game.
Aim and rules of the game
Kill'em all :)
One of the best 3D-first person shooters, ported to Menuet and KolibriOS.
The game is controlled by keyboard. Press "Space" - to jump, "Ctrl" - to shoot, digits - to change weapons.
More information can be found here