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[IMPORTANT] Windows 11 Smart App Control Issue (Failed to load il2cpp)

Loop Dungeon - Incremental · Community Announcements · October 19, 2026

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Dear players,

[p align="start"]I am aware that some players on Windows 11 are experiencing a crash at startup with the error message: "Fatal error: Failed to load il2cpp".

[p align="start"]Why is this happening? My investigation shows that this is caused by Windows 11's Smart App Control (SAC). The game uses Unity's IL2CPP backend, which relies on a core dynamic link library (GameAssembly.dll). Because the game has not yet been code-signed, Windows SAC currently identifies this .dll file as untrusted and blocks it from loading, leading to the crash.

[p align="start"]I am actively working on a permanent fix:

  1. I am obtaining a Code Signing Certificate for the game's executable and DLL files to prevent future blocks.

  2. I am updating my Unity engine dependencies to the latest versions to improve compatibility with Windows security features.

[p align="start"]In the meantime, please try the following workarounds to play the game now.


Temporary Workarounds (Try in order)

[p align="start"]Method 1: Unblock the Game Files (Most effective workaround) Because the game files were downloaded from the internet, Windows flags them with a "Web Mark". You can manually unblock them:

  1. In your Steam Library, right-click the game -> Manage -> Browse local files.

  2. In the game folder, select all files (Ctrl + A).

  3. Right-click any selected file and choose Properties.

  4. At the bottom of the General tab, check the box for Unblock.

  5. Click Apply and OK.

  6. Restart the game.

[p align="start"]Method 2: Update Windows Security Intelligence Sometimes the block is due to outdated local security definitions:

  1. Open Windows Security.

  2. Go to Virus & threat protection.

  3. Under "Virus & threat protection updates", click Check for updates.

  4. Restart your PC and try launching the game again.


Still having issues?

[p align="start"]If you still cannot launch the game after trying these steps, please contact me with the following info:

[p align="start"]Contact me at: \[Your Support Email / Discord / Steam Discussion Link]

[p align="start"]I sincerely apologize for the inconvenience and thank you for your patience. I will release a code-signed build as soon as possible.

[p align="start"]Best regards,

Playsect

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