ray_afraid said:

Leonardo said:

I stumbled upon a glitch in SMB1 I had not seen before.

Koopa stuck in a pipe

That's cool! I thought I'd seen all there is to see of that game. How do you do it?

I don't know how or why it appeared, it probably had something to do with the number of enemies that were present on screen before that Koopa spawned. I wish I had taken note of which world it was, instead I just took a couple of pictures with a crappy webcam and then kept playing as normal.