I dontknow how doable this is but a gametype called "Wabbit hunting"

A solo match, on the HUD a text area thats say" YOUR TARGET IS . each player starts out a random assigned player which they are hunting. You can kill anyone one you want in a deathmatch style, but points are only awared to you if you kill you target. after each kill it switches. It is random assignments meaning one person could have 5 people after him, or someone could have no one.