To uninstall trackballs just follow these instructions.
/debian/wheezy/main///install/index.html An OpenGL-based game of marbles through a labyrinth Debian 7.0 games 1.1.4-4.1
sudo apt-get remove trackballs
Which will remove just the trackballs package itself.
sudo apt-get remove --auto-remove trackballs
This will remove the trackballs package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for trackballs then this will work.
sudo apt-get purge trackballs
Or similarly, like this trackballs
sudo apt-get purge --auto-remove trackballs
|Description||An OpenGL-based game of marbles through a labyrinth|