Install criticalmass by entering the following commands in the terminal:
sudo apt update sudo apt install criticalmass
Description:
Shoot-em-up a la galaxian
criticalmass, aka critter, is a shoot-'em-up in the style of Galaxian with very colorful and smooth graphics (provided that you have 3d acceleration) . Note: criticalmass uses OpenGL, and will probably not run well if you do not have a 3d accelerator which is supported by X.
Homepage: http://criticalmass.sourceforge.net/critter.php
Version: 1:1.0.0-6
Section: universe/games