I tried

sudo apt-get --purge remove snipe2d

But I guess 'snipe2d' isn't the name of the game....so how do I find out what it is and how to put it into my terminal?

P.S. this is what it says when I put in the above code:

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package snipe2d

EDIT: The official name of the game in question is: orbital eunuchs sniper