Annihilation was left almost abandoned following the release of Minecraft, where Mojang took a little break themselves from Minecraft, knowing their game had finally reached it's moment. However, in the rush to release Minecraft at Minecon 2011, no one in the developing team found the bug in the code that allowed Annihilation to merge itself into the main branch of Minecraft's code, giving it access to every bit and byte of the game.
(Entity Zero)