Opposing-Force-1.21.1-3.0.0-beta4.jar is a beta file of the Minecraft mod Opposing Force for NeoForge, made for Minecraft 1.21.1. It was published on October 1, 2026 and is 1.9 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Opposing Force mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
