New Super Mario Bros. Walkthrough Part 2: Fitting Right In

So many tight spaces to get into around these parts. Guess' we'll just have to squeeze through them in various ways to progress! ;D

Time Stamps:

World 1:
0:00 1-4
4:47 1-5
8:28 1-Life Mushroom House
9:01 1-A
12:47 1-Castle

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Enjoy!