See first video and world 4 part 1 for all details.
0:02 Rancor Pits: A much shorter and simpler level than most other levels in the same world. Just go to the end.
2:46 Mountain Foot: A trickier level that involves a bunch of climbing and dodging strong enemies along the way. One of the trickiest parts of the whole thing is at about (you have to be fast to get by that unscathed).
7:17 The Gauntlet: Another fairly short level, but it's actually pretty hard. You'll have to dodge a lot of Bullet Bills in the first half, then there are enemies on parachutes to deal with in the second half. In the second half, it is near impossible to get the last Dragon Coin without taking a hit if you have a fire flower since your spin jump kills the Spiny you try to ride.
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.
2