When you are joining someone else's game, the mutators in use will be listed in the info on the bottom-left of your screen.
In the first Killing Floor, you can easily add mutators from a Mutator Menu available when you're setting up your match. Mutators are ways to modify a match of Killing Floor or Killing Floor 2 in a variety of ways.ĭepending on the effect of the mutator, using it may disable your ability to gain progress in your Perks or earn Achievements while the mutator is active.
