Install black-box by entering the following commands in the terminal:
sudo apt update sudo apt install black-box
Description:
Find the crystals
There's a black box. You can shoot in and watch, where the shot leaves the box. In the box, crystals are reflecting the shots. You have to guess where the crystals are hidden, by watching your shots.
Homepage: http://www.linux-games.com/black-box/
Version: 1.4.8-4
Section: universe/games