This one? 
You can use it to rotate the tracks depending on what you last pressed on the D-PAD (unless its the way you came from when you touched the track)
(spoiler alert: button tracks do not work like this)
227 days ago(+1)
Well ...
I had a lot of fun playing, the levels are diverse while all being real levels with some challenge, challenge which is perfectly balanced for the context, and once again this is served with perfect NES presentation.