Description:

Shortly after landing on an alien surface you learn that hundreds of your men
have been reduced to just a few. Now you must fight your way through heavily
fortified military installations, lower the city's defenses and shut down
the enemy's war machine. Only then will the fate of humanity be known.

-- You need PAK files for Quake II to run this game --

Install the PAK files in ~/.yq2/baseq2 or, alternatively for a system-wide
installation, in /usr/lib64/games/quake2.

See the upstream README for detailed instructions about installing the data
files: https://github.com/yquake2/yquake2/blob/master/doc/02_installation.md#game-data-setup
(also included in /usr/share/doc/yamagi-quake2)