As in characters? There are 8 players to choose from, Sonic, Tails, Knuckles, Amy, Shadow, Cream, Silver and Blaze, in the multiplayer section, but only Sonic is playable in the main storyline.
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in sonic generations game,50 power rings
shadow:30 fire solescream:42 fire solessilver:84 fire solesblaze:105 fire soles
There is sonic, tails, knuckles, amy, rouge, eggman, shadow, chaos zero, tikal, dark chao, normal chao, metal sonic. So that would be 12 characters.
you can find any world ring in its world just by doing as many missions in that world as possible until you get a cut-scene. There is one world ring in each world.
You have to get as many rings as you can and hit all his eyes out and if he trys to attak you with all his hands get in the middle because there is a square there.