> ## Documentation Index
> Fetch the complete documentation index at: https://help.freakhosting.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Install Server Mutators in KF2

> Install and activate server mutators on your KF2 server to change game rules, add custom weapons, modify Zed behavior, and create unique gameplay modes.

## Rulebook Modification

<CardGroup cols={2}>
  <Card title="Difficulty" icon="gauge-low">
    Beginner
  </Card>

  <Card title="Time" icon="clock">
    5 Minutes
  </Card>
</CardGroup>

***

> 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 like `ModName.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

1. Navigate to the FREAKHOSTING **Startup** tab.
2. Locate the **Mutators** field.
3. Enter the class name provided by the mod author.
4. If you want to run **multiple mutators**, separate them with a comma (no spaces):
   `?Mutator=ModA.ClassA,ModB.ClassB`

***

<Important>
  ### The "Unranked" Trap

  Most mutators will cause your server to become **Unranked**, meaning Perk XP is disabled. Always check if a mutator is on the [Tripwire Whitelist](/games/killing-floor-2/enabling-prestige-leveling) before adding it to a public server.
</Important>

<Note>
  ### Support Channels

  If you need assistance or have any questions, please contact our support team:

  * **Live Chat:** Available on our website
  * **Website Ticket:** [Submit a Ticket](https://freakhosting.com/clientarea/submitticket.php)
  * **Discord:** [Join our Community](https://discord.gg/freakhosting)
  * **Email:** [support@freakhosting.com](mailto:support@freakhosting.com)
</Note>

<Tip>
  ### First Month Discount

  Use code **KB20** at checkout to get **20% off** your first month of hosting!
</Tip>

***

<div align="center">
  **Last Updated:** January 2026 | **KF2:** Mutators active.
</div>

***

<Note>
  ### Need Extra Help?

  If you encounter any issues, our support team is ready to assist:

  * **Live Chat:** Quick assistance via our website.
  * **Support Ticket:** [Open a Ticket](https://freakhosting.com/clientarea/submitticket.php)
  * **Discord:** [Join our Community](https://discord.gg/freakhosting)
  * **Email:** [support@freakhosting.com](mailto:support@freakhosting.com)
</Note>

<Tip>
  ### Save on Your Hosting

  Ready to get a new server? Use code **KB20** at checkout for **20% off** your first month!
</Tip>