There are so many paths to miss the rings... This one is a bit harder than with Tails because of the double jump to reach the hidden monitors in the tower.
258
17/26
10-21-14
This is just to update my comment. I have a video. I got 259 rings
259
1/26
10-21-14
Many rings are hidden and easy to miss. Be sure you took every path. http://www.youtube.com/watch?v=Pv9G4dlB3m0