First Version is a release file of the Minecraft mod Secret Observation's for NeoForge, made for Minecraft 1.21.1. It was published on March 28, 2026 and is 0.1 MB in size. For the full description, screenshots and every other version, visit the Secret Observation's mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
