Hrot

You start in a civil defense shelter deep under a Prague Metro station. As a proud holder of the military readiness badge you know what your duty is: put on a non-functioning gas mask, load the vz. 52 pistol and protect the peace and your socialist homeland from the strange intruders.

Hrot is a single-player retro FPS set in a small socialist country neighboring Soviet Union (Czechoslovakia) after an unspecified disaster in 1986. Those times were dark and terrifying and so is the game.