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I have a Minecraft PE single player world. When I was playing somehow someone joined my game. How could/can this happend?
If you have the "Local server multiplayer" setting on, anyone in the same network as yours can access your world.
Are you sure someone joined, or did you meet your first villager?
If someone joins, it will say " has joined", and they're name displays above them.
If it's some weirdo that just says "hmm" and stands in your way, then it's a villager.
Required, but never shown