UsefulBlocksV1.0.jar is a release file of the Minecraft plugin UsefulBlocks [1.12 and 1.13], made for Minecraft 1.12. It was published on July 24, 2018 and is 0 MB in size. For the full description, screenshots and every other version, visit the UsefulBlocks [1.12 and 1.13] plugin page.
How to install: Put the .jar into the plugins folder of your Paper, Spigot or Bukkit server and restart the server.
