Welcome to Conquer Club!
Terminator is played like standard, except you get points from each person you eliminate instead of everyone's points at the end of the game.
In assasin you have a target, marked with a red crosshair, and you need to eliminate your target before anyone else eliminates theirs.
You can find out more in the instructions tab at the top of the page, or here.
http://www.conquerclub.com/public.php?page=instructions3