ERROR422

ERROR422 is a horror mod that gives the game itself the role of antagonist. Unlike many horror mods that rely on entities chasing the player, it works through the game's behavior: music can be replaced by static, a random lightning strike can appear, and the game can seem to take control away from the player. The author recommends playing without looking at the screen in advance for the intended experience.

Several parts are taken from the original ERROR422 assets and the vanilla code, and the author adds only things already present in the original. A timer resets the game after roughly one to one and a half hours of play. Multiplayer is disabled by default but can be re-enabled in the config, and several behaviors can be turned off through config options. Client and server both need the mod, so the server and every player run it.

The mod is published for NeoForge only, with builds for 1.21.1 – 1.21.5. The latest file, 2.2.0, targets 1.21.1 and was released on 2025-08-04. It was first published on 2025-03-22 and is released under All rights reserved, so it is not open source.