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We move on to the Cloud World. Why there's both a cloud world and sky world, I have no idea, but it is starting to get more difficult. These levels aren't too terrible, but they are quite tedious because if you make one tiny mistake you have to go all the way back to a checkpoint. This is especially challenging in world 3. There are also two hidden paths as well, in world 1 and 3. World 3's is a little difficult to get to.