It's probably because everything doesn't seem complete. I ran up the stairs and ended up on an image with no text and no indication of what to do.
Try running up the stairs backwards. Worked for me in Mario 64.
Originally Posted by Rater202
Needs more Speedo.
You know... only in Pony can the thought of putting a speedo on a pony make it seem dirtier.
...huh. A Google search for Pony speedos turned out strangely clean.