Valley of Bowser 4 Secret Exit Walkthrough - Super Mario World 100% Walkthrough
I highly recommend having the cape for this level. Take Yoshi to end of level to grab the Key. This exit leads to Star Road.
The green tube before the beanstalk takes you to an icy area where you can get a feather, but when you exit that area it takes you backwards in the main level so it's not really worth it. The level's sole Dragon Coin is found in that icy area.
After the long drop through the blocks there is a lone block which has a 1-Up inside.
This level's regular exit: https://youtu.be/wmNB4so2638
Super Mario World 100% Walkthrough Playlist: https://youtube.com/playlist?list=PLWdUn5TiM4AnmbcVfEnM258NfYQziI8w5
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