Minecraft is no stranger to player-made modifications. From the game’s inception, players have been taking the code and customizing it to do new things.

They're in a week-long Minecraft Modding and Java coding camp called ID Tech. They've been creating and testing Minecraft Mods, making tools for this virtual world.

The second year is when a large portion of that "coding" began, which is when a Minecraft user uses command blocks powered by redstone to make certain actions happen in-game.