Minecraft 1.12 Redstone Command Blocks, 4,355 2,872 bytes
(Size determined by saved structure block file size.)
Here is a full YouTube overview, but I'll try to outline the code below.
Minecraft, 358 293 277 276 bytes
Implementing Minceraft in Minecraft
Should be run as a set of commands in game. Should be run on a fresh superflat (redstone ready) world.
Byte count is the amount of ...