Luigi's Adventure 3 OSE Ep #5 - No Barbarians In Sight
I must say that World 4 is pretty well hidden. I do remember this secret from long ago (same goes for the secret exit to open World 5). There are two levels that don't have midpoints at all, and I guess are shorter in that sense. That platforming part in Barbarea Mine 4 was very tricky and confusing, since the pattern in which the platforms came down was very nonsensical.
This let's play is also a race to the finish against let's player aterraformer:
http://www.youtube.com/user/guitaristdude0
Credits:
LP - SMCslevelengine
Hack - Anikiti
Original SMW - Nintendo
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levelengine presently has 690,106 views for Super Mario World across 1,525 videos, accounting for over 28 days of watchable video on his channel. This is 18.28% of the total watchable video for Super Mario World on levelengine's YouTube channel.