unknown_file.jar

Installed on a client or a server, the jar brings a set of cursed features that alter how worlds and the game interface behave. Its author notes describe erasing worlds, banning worlds and creating popups, and the mod also includes textures inspired by the Alpha and Classic eras and a testing set for hunger mechanics from the Modern Beta period.

The mod also carries some assets drawn from Scott Cawthon's games, which the author notes say may change in future versions. Runs on NeoForge only, for 1.21.1, with the latest file 0.1.8 published on 2026-06-03 in the beta channel. Released under the Creative Commons Attribution Non Commercial 4.0 license, so the code is not open source. The mod was first published on 2026-02-10 and last updated on 2026-06-03.

Both the server and every player need the jar, since the environment is client and server. Trevol010 lists the mod under Cursed, with Adventure and World generation as secondary categories. Other NeoForge mods for 1.21.1 are also listed on the catalog, and this one is in the same loader and version range.