My idea is that the earth used to be normal, and there was an experiment gone wrong that made the world a cube and almost everyone zombies. The dungeons are the ruins of the survivors, and that you are 1 of the 2 people left. The other one is Herobrine, who killed all the other survivors and put mob spawners in their dungeons so the other ones who try to steal the chest get killed.
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I use an atomic bomb on the user below's computer
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OT: It's probably underground near your house, just try to ignore it or level the place with TNT :3
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