Upside Down 1.2.4 (1.21.8) is an alpha file of the Minecraft mod Upside-Down: The Revenge for NeoForge, made for Minecraft 1.21.8. It was published on May 17, 2026 and is 5.9 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 Upside-Down: The Revenge mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
