New Super Mario Bros. Walkthrough Part 17: Secrets in the (Shallows &) Sky
Channel: PkGam
Date: 2014-08-17

Every level covered here has a secret exit attached to it so be on the look out for them!

Time Stamps:

World 7:
0:00 7-4 (Normal exit)
3:49 7-Item Mushroom House
4:25 7-5 mistake, lol!
4:51 7-4 (Secret exit)
(The above are connected)

6:25 7-5 (Both exits)
12:23 7-6 (Both exits)

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Enjoy!