King of the Hill:
It's works like the normal "Wave Game" but somewhere on the map will be an area highlighted with a glowing ring. Players usually get some kind of benefit from staying within the ring, things like points needed to win the round (in vs games)
But with KF you could have something else like, only players inside the ring will get money for the kills they make. When the round is over everyone goes shopping and the "Glowing Ring" appears at a new location somewhere else in the map.
This way you are forced to camp in different places. Some spots will be much easier than others. Leaving the ring when a fleshpound charges you may be needed but when you make the kill you don't get any money for it because you killed him when you were outside of the ring.