New Super Mario Bros. Walkthrough Part 7: Patience Please!

You may wanna go fast, maybe even faster faster fasterfasterfaster, but it would be wise to not do so most of the time here!

Time Stamps:

World 3:
0:00 3-B
2:56 3-C
5:00 3-Life Mushroom House (Yeah, I miscounted, lol! I got 6 Lives here)
5:59 3-Castle

World 4:
10:10 4-1
15:14 4-Life Mushroom House

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Enjoy!