Sonic the Hedgehog (Sega Genesis): Four crushers, one of which contains Dr. Robotnik.
Sonic 2 (Sega Genesis): Metal Robotnik
Dr. Robotnik's Mean Bean Machine: Dr. Robotnik
Sonic CD: Robotnik in a sphere with spinning metal plates going around it
Sonic 3: Robotnik with a giant metal claw
Sonic & Knuckles: Metal Robotnik
Sonic 3D Blast: Miniature Death Egg
Sonic Adventure: Perfect Chaos
Sonic Adventure 2: Biolizard
Sonic Heroes: Metal Sonic Monster
Sonic Unleashed: Dark Gaia
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Metal Sonic doesn't get a story in Sonic Adventure however you can play him in trial mode to unlock him get all the emblems you can go to every level Sonic goes to as Metal Sonic you can even fight the bosses and play the minigames.
Free Sonic games can be found on a number of websites. Sonic Games, Daily Games, Games List, and One Online Games all feature free online Sonic games.
Get all the chaos emeralds and fight the final boss.
Here are the Sonic games for the Wii: Sonic and the Secret Rings, Mario and Sonic at the Olympic games, Sonic Unleashed, Sonic and the Black Knight, Sonic Riders Zero Gravity, Sonic Colors, Sonic The Hedgehog, Sonic & SEGA All-Stars Racing, Sonic made an appearance in Super Smash Bros. Brawl, but that's not an actual Sonic game.
2005