This is actually a game glitch, but it only happens since the Practice ROM allows me to restart the level at any point of the game. I felt like sharing this because it's kind of cool lol

cool!

k

You can do this with any vine in the game. Also this works in the older versions of the ROM as well.

Yes, I know about the vine glitch. But what I didn't know would happen is the part afterwards where the second vineblock gets all warped n' stuff. I only mentioned that I was using the v4.0 of the Practice ROM since I don't think there was another SMB2J Practice ROM, so this glitch (for World 8-2) would only work in this version of the ROM.