I have used up too many lives, and wasted too much time trying to get this thing! I've read numberous other cheat sites, and have heard two different things, both of which I've tried.
1) Jump on the Bones to be able to wall jump
2) Jump on the Bones to make it out of commission temporarily then, run and wall jump up
No matter what I do, I can't get up that pipe. I did it once using a stored mini mario mushroom I had (I've tried to go through the level as mini mario as well, but it's too hard to jump fast enough with all those spike wall coming at you) but then once I actually got up the pipe to that crazy room where the coin is, I died. I have been going through the motions of getting this coin for 2 days now, and it's driving me crazy!! Any tips would be very much appreciated. Thanks!