Install gfpoken by entering the following commands in the terminal:
sudo apt update sudo apt install gfpoken
Description:
Recreate a grid of mirrors from clues given by tests
Send balls through an invisible grid of mirrors (and other interesting widgets) and observe where they end up. Then, try to recreate the same grid from the results you just obtained.
Homepage: https://savannah.nongnu.org/projects/gfpoken/
Version: 1-2build1
Section: universe/games