1 min readUpdated Oct 4, 2026

How To Add Mutators On Your Killing Floor Server

Mutators change the rules of every game on your Killing Floor server. You can run several at once.

MutatorWhat it does
BeatDownMelee weapons only.
ClotsOnly Clots appear.
BloatsOnly Bloats appear.
GorefastsOnly Gorefasts appear.
SirensOnly Sirens appear.
FleshpoundsOnly Fleshpounds appear. Bring a big gun.
MachinePistolsThe 9mm pistols fire fully automatic.

Adding Mutators

  1. 1
    Log in to Bropanel and select your server.
  2. 2
    In the sidebar, go to Settings.
  3. 3
    Under Gameplay, find Mutators and enter the mutators you want, separated by commas, for example BeatDown, Clots.
  4. 4
    Click Save & Restart to apply your changes.

To turn mutators off, clear the Mutators field and click Save & Restart.

Tip

For a custom mutator, upload its files to the System folder and enter its class name in Mutators, for example MyMutator.MutMyMutator. The mutator's readme tells you the class name.