Singleplayer Anticheat

Once active, the mod generates hidden structures that react to cheating: a verification block disappears, command blocks are detected at once, and the run is ended by a kill. Cheats enabled through other mods, such as Axiom, still lead to the kill command executing and the world ending. The intent is to make cheating impossible without destroying the world itself, since the enforcement is built into the save rather than applied afterward.

The mod also changes what the player can reach. It removes the Open LAN button entirely, intercepts command attempts on the client side, and automatically kills players who enter creative mode. A self-healing barrier structure regenerates constantly around the monitored area, and a force-loaded chunk keeps the world under watch at all times.

Fabric API is required, so it must be installed alongside Singleplayer Anticheat. The mod is released under the MIT License and is not open source. Files target Minecraft 1.21.11 and 26.2, and the latest Fabric build is 1.1.0 for 26.2, dated 2026-08-15. The server and every player need the mod installed.