In Alpha 0.0.0, Item IDs and Block IDs were not properly validated. This allowed players to create items and blocks with arbitrary IDs. When used in specific ways, these could lead to unusual behaviors.
Instead of placing a block, the world inverted . Colors became negatives: purple skies, green-turned-red clouds, and the single grass block became a pulsing black cube. The chat window—empty, uninitialized—typed a single line on its own: minecraft alpha 0.0.0 glitch
Have you seen the 0.0.0 glitch? Check your old Alpha saves. You might already own a world that doesn’t exist. In Alpha 0