World 4
Another no hit world.
4-1: The introduction of Lakitu! I took him out once or twice, other than that this level is extremely easy.
4-2: Underground level, I just walked above everything (at the top of the screen) for as long as I could. The jump at the end of the level is a little tricky, though- I took my time, making sure I would not mess that up!
4-3: Really quick level. The treetops are now mushrooms! This level is actually really fun to play.
4-4: Ugh, I hate castles that require you to take the right path to proceed, they're a pain if you don't use a guide! Thankfully I remembered how to do this one.
So, World 4 is no more difficult than the first three. Terrific. I also got another extra life here!
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http://www.gamefaqs.com/boards/228-movies-video-and-dvd/58949084