Nice of you to get footage of that, I had the same thing happen during my casual playthrough but didn’t think to record it. Hopefully there’s a practical use for it, but clipping back in would probably be as difficult as clipping out

Oh really? When I have some time I might have to test out a few things then. The one time I had done it I had ended up completely on the other side of the wall so it just killed me >_>

Edit: Oh to clarify I meant after completely going outside of the wall when referring to clipping back in

Had a play around with it, and if I'm understanding right it's caused by wall-jumping off an object moving along a wall (so in the case of course 51, jumping off the right side of the block moving up and down the wall). I was personally only really able to move one block to the left or right while in the wall, so not sure how much movement can be done in a wall. If a way to move better in walls is possible, this would make clearing that level much faster. I've linked my video attempt at wall-clipping here (at the moment of the wall-jump I made a mental note that I was holding up and left, although I doubt up was necessary) https://twitter.com/PeckaGee/status/1322793712917770241?s=20

The other most likely application I can think of is maybe in course 57 to clip through the "stairs" that form at the very start so we wouldn't have to go around them. I did have a few goes at this but haven't been able to pull it off yet. If it could be pulled off efficiently, this would also be a decent time save.

Edit: Also on the note of course 41, that actually makes it so much easier and would possibly make the all stars time for that level a bit faster for that 3rd star. Pretty good catch on that, I wouldn't have thought of that at all

the problem i find with this game though is that most of the course dont actually have any reason to clip out of bounds as most of the courses are either surrounded by a wall of spikes or are just completely flat... the current times we have without oob are already faster then clipping oob, however i can see some uses for clipping oob for example course 3 3star%, but unfortunately my understanding of that glitch is its level specific... The hitbox thing is actually really helpful tho.