Plays inside your own copy of FNAF: Security Breach (Unreal 4.27, D3D11 mode), on your device, not in a browser tab. Opens github.com in a new tab.
How to play
Have your own copy of FNAF: Security Breach (Unreal 4.27, D3D11 mode) installed: the mashup plays inside it.
Download it from its release page on GitHub (it runs on Windows).
Install it as its page says. What it asks for is just below, in the list's words.
Start the game the way its page says: some mashups come with a launcher of their own.
What it asks for
Windows 10/11, FNAF: Security Breach (Steam, launched in D3D11 mode), Minecraft Java Edition with the official launcher (Minecraft 26.1.2 with Fabric); the release installer sets up UE4SS, ReShade and the Fabric profile, while building from source needs JDK 25 and Visual Studio 2022 Build Tools.