Atfer Sonic and Tails stop Dr. Robotnik in the Death Egg, Sonic and Tails is confronted by Knuckles the Encinda.
Sonic and Tails have to go to though Six Zones:
Angel Island: This is where the game begins, mid way though act one, the island is set on fire maybe to stop Sonic and Tails.
Hyodcity: After Knuckles breaks the bridge at the end of Angel Island, Sonic and Tails or in a underground maze.
Marble Graden: Sonic and Tails is up up up in the air and fall in this old marble full garden of death trap.
Carnevel Night: Tails is flying Sonic and Him to this balloon fill and filying barrells zone.
Ice Cap: Sonic and Tails is shot of a cannon and is blast into this snow fill mountain.
Lanch Base: In this final zone, Sonic ans Tails is blast into Dr. Robotnik's Launching Base for the repaired Death Egg.
I give Sonic 3 a 9.4 out of 10.