To uninstall darkplaces just follow these instructions.
sudo apt-get remove darkplaces
This will remove just the darkplaces package itself.
sudo apt-get remove --auto-remove darkplaces
This will remove the darkplaces package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for darkplaces then this will work.
sudo apt-get purge darkplaces
Or similarly, like this darkplaces
sudo apt-get purge --auto-remove darkplaces
|Maintainer||Debian Games Team <firstname.lastname@example.org>|
|Description||Game engine for Quake and similar 3D first person shooter games improved visual effects and lighting and many features for mods. It can be used to play various games based on the Quake engine, such as Xonotic, Nexuiz Classic, OpenQuartz, and Quake itself.|