To uninstall xletters just follow these instructions.
sudo apt-get remove xletters
This will remove just the xletters package itself.
sudo apt-get remove --auto-remove xletters
This will remove the xletters package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for xletters then this will work.
sudo apt-get purge xletters
Or similarly, like this xletters
sudo apt-get purge --auto-remove xletters
|Maintainer||Debian Games Team <firstname.lastname@example.org>|
|Description||Type falling words before they land Words chosen from the system's wordlist fall from the top of the screen and must be typed correctly to score. In a challenge stage, random sequences of characters appear instead of words. Head-to-head networked play is possible with xletters-duel.|