This is a download for a Seed which gives you the closest thing you can get o a Superflat World. You will spawn in the middle of a HUGE, flat ice surface, which covers almost the whole world, since there is no infinite terrain in Pocket Edition. If you stand on one side of the ice, the other side would be far behind the horizon. If you don't know, Superflat Worlds are very useful worlds, that are completely flat. They are used for building things in Creative Mode.