Okay I found this one when i was around 7 years old which was over 10 years ago, but i never thought to post it till today, after playing SML (Super Mario Land). In levels 4-1 and 4-2 in the pipes where you hit the invisible block to get to the coins and pipe, there's blocks under the pipe. When you smash them the bottom of the pipe is exposed, and if you jump in a certain direction and hit the bottom of the pipe, you'll float out of the room, and come back out the pipe. I'm sure everyone already knows this, and i've known it for the majority of my life, but i figured it out a looooong time ago.
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