RubyDung

This Game Is Based On Another Game - RubyDung was an unreleased strategy sandbox game created by Markus "Notch" Persson before Minecraft, which was in development from February 2009 or earlier until May 2009 at the latest. Not much else is known about the game other than that it was influenced by Dwarf Fortress, and that it was canceled early in development, before being released. Notch's next game would be Minecraft (later known as Minecraft: Java Edition), which is based on RubyDung's codebase.