I was trying to get all the Chaos emeralds. but then i accidentally read online that all that happens is you get a picture of Metal Sonic hinting that he'll be in Episode 2. Now it doesn't seem worth the effort. Back in the day on the Mega Drive it was sick when you got all the Emeralds cos you could turn into Super Sonic and Hyper Sonic.
EDIT - nevermind, I just read somewhere else that you can play as Super Sonic in Sonic 4. So I'm gonna keep trying. It's harder to get the Emeralds in this one.
Sonic 2: 19, 65, 9, 17, A + Start. Start Menu A + Start, 4, 1, 2, 6 A + Start on any level. Collect 50 rings and jump.. collect more rings to last longer, finish level. LOL.
I still have a few ps2 games i need to finish playing. The Godfather, Scarface, Sonic Heroes. Actually, Sonic Heroes wasn't great, but I was enjoying it, especially fighting Robotnik (I refuse to call him Dr. Eggman).