This is just stage 1 of many "Asshole" Super Mario Level hacks that look absolutely diabolical to play. You'll laugh, you'll want to cry, and you'll wonder whether you would kill yourself if you had to play these levels. Watch them all, it's an entertaining time.
The first video will give you links to the rest in the "related videos" section.
http://youtube.com/watch?v=r86NLwCYXfk&feature=related