Hey guys
I was playing with sprite 270, and it does not only do pipe smashing!!!

Try this data: 12 32 12 32 12 32

It creates this really long mini pipe when your camera pans over to it!!! It stays there as long as sprite 270 is in view. If your camera scrolls of, it disappears.

I'll hack this sprite and organize info here like I did for sprite 83.

11 11 11 11 11 11 Solid big pipe that you can stand on. Stays forever.

The pipe can also be entered if you place the entrance in the right spot.

Info here is assuming first byte is byte 1. Nibbles are numbered 0-15.
Info:
Byte 6 -> Controls how long the pipe is.

it actually "creates" the pipe because sprite 270 is used whenever you collide with a pipe being Mega-Mario.

If you collide with a pipe laterally you break it, but if you collide with it from the end, you "push" it.

The behavior you're seeing is the sprite being pushed. The pipe turns into sprite 270 while it's doing the "being pushed" animation, and then it reverts back to a normal pipe but one block shorter. That's why you can "create" pipes with sprite 270.

Ooohhh... Interesting.
I just need to find out what specific nibbles control which things. But what explains the first data I pasted, which creates a pipe without collision?

I guess it's because it somehow gets "stuck" in the "animating" status. I dunno.