RubyDung inspired Notch to make Minecraft when he wanted RubyDung to have a first person view, but when he tried making this, he thought that the textures were too blurry and distorted. Shortly after Notch's days coding for RubyDung, he came across the game Infiniminer, which put down the foundations for Minecraft.
On October 30, 2009, Notch talked about RubyDung on his blog in an entry titled "The Origins of Minecraft".
Creation of Minecraft
Soon, Notch played Infiniminer. He found out that this is the game he wanted to create. After some time, Notch created Minecraft, which soon gained popularity.
Minecraft's source code came from RubyDung, so early versions of Minecraft have the rd (RubyDung) prefix. Early Minecraft versions were based on a combination of Infiniminer, Dungeon Keeper and the source code of RubyDung.