Just uploaded by the Sonic the Hedgehog YouTube account.
Also shows some variations of both with Tails & Knuckles (and different scenery), and some new footage of Studiopolis Act 2 & Chemical Plant.
For those who don't know, in the Special Stage collecting sphere increases your speed when you collect enough of them to go up a match speed, while collecting rings increases your time. Your goal is to catch the UFO, which will give you a Chaos Emerald.
Blue Spheres is for checkpoints hit to go to a bonus stage for extra goodies, IE power-ups, lives, rings, etc.
Green Hill Zone Act 1 Time Attack: https://www.youtube.com/watch?v=4FvYZotwjOU