What is Anomaly?

Anomaly is a client and server modding framework for SCP: Secret Laboratory. It runs as a separate modded game install plus a server-side LabAPI plugin for Anomaly-enabled servers.

What Anomaly does

• Creates a separate modded SCP:SL install. Your vanilla Steam copy is left untouched.
• Loads MelonLoader mods from the Launcher’s Mods/ folder.
• Lets the Launcher install approved public repository mods and manage enabled state.
• Lets Anomaly servers authenticate modded clients and provide custom assets at runtime.
• Identifies players with stable @anomaly IDs based on a local identity file.

What Anomaly is not

• Not a cheat framework.
• Not affiliated with NorthWood Studios or SCP:SL.
• Not a replacement for Steam or the base game.
• Not compatible with vanilla public servers.

You need a legitimate Steam copy of SCP:SL to use Anomaly.

Disclaimer and EULA boundaries

The SCP:SL EULA permits this kind of modified client, but NorthWood holds the right to ban you for stepping out of bounds. The following are not supported:

• Connecting to public or non-Anomaly servers with the modded client.
• Re-enabling disabled vanilla authentication or anti-cheat behavior.
• Creating, distributing, or using cheats.
• Spoofing users or bypassing bans.

Use at your own risk

The Anomaly developers and contributors are not responsible for bans or other consequences from using this modification. Do not report Anomaly issues to NorthWood.

Credits

Anomaly’s decentralized identity model is inspired by and credited to the Axon team. The Launcher’s Steam download flow is built on SteamKit2.

Where to go next

If you’re here to play, continue to Before You Install.

If you’re running a server, jump to What Enabling Anomaly Changes.

If you’re writing a mod, start at Architecture Choices.