World 4: Kuribo's WoodsI was really worried about how I was gonna record this video... That stage with all of the flying Cheep Cheep is the one stage in this world that makes me dread going through it. On my very first playthrough of this world (as in, when I first discovered this hack), I spent hours on that level. Even in the recording of this world, I had to keep playing it over and over again, which resulted in me having to begin recording the whole world over again. This is the reason why I just used the Starman and Raccoon Mario to fly through the level so I could finally make some progress.
On a similar note, I let my younger brother play that stage and he decided that he never wanted to play it again. :)