Rulebook Modification
Mutators are essentially plugins for Killing Floor 2. They can range from simple visual changes (e.g., “Big Head Mode”) to complex logic overrides like “Infinite Ammo” or “RPG Systems.” Activating a mutator requires two steps: downloading the files via the Workshop and defining them in the startup command.
| Reading Time | Difficulty | Last Updated |
|---|---|---|
| 4 minutes | Intermediate | January 2026 |
1. Identifying the Class Name
Every mutator has a “Class Name” that looks likeModName.ClassName.
- Finding the Class: This is usually provided on the Workshop page. For example, the Controlled Difficulty mutator uses
ControlledDifficulty.CD.
2. Activation via Startup
- Navigate to the FREAKHOSTING Startup tab.
- Locate the Mutators field.
- Enter the class name provided by the mod author.
- If you want to run multiple mutators, separate them with a comma (no spaces):
?Mutator=ModA.ClassA,ModB.ClassB
Support Channels
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Last Updated: January 2026 | KF2: Mutators active.