Im gonna start to list every game I complete. Well here goes nothing: (In no particular order)

Sonic The Hedgehog (Megadrive)
Sonic The Hedgehog (Gamegear)
Sonic The Hedgehog 2 (Megadrive)
Sonic The Hedgehog 3 (Megadrive)
Sonic The Hedgehog 3 & Knuckles (Megadrive)
Sonic The Hedgehog 2 & Knuckles (Megadrive)
Sonic & Knuckles (Megadrive)
Sonic Triple Trouble (Gamegear)
Sonic Chaos (Gamegear)
Sonic Drift (Gamegear)
Sonic Spinball (Megadrive)
Sonic 3D (Megadrive)
Sonic CD (Mega CD)
Dr. Robotnik's Mean Bean Machine (Megadrive)
Rocketknight Adventures (Megadrive)
Sparkster (Megadrive)
Mickey Mania (Megadrive)
Mickey Mouse & Donald Duck: World of Illusion (Megadrive)
Quackshot (Megadrive)
Daffy Duck in Hollywood (Megadrive)
Sylvester & Tweety in Cagey Capers(Megadrive)
Streets of Rage (Megadrive)
Teenage Mutant Ninja Turtles: The Hyperstone Heist (Megadrive)
Outrun (Gamegear)
Outrun (Megadrive)
Chase HQ 2 (Megadrive)
Crash Bandicoot (Playstation)
Crash Bandicoot 2: Cortex Strikes Back (Playstation)
Crash Bandicoot 3: Warped (Playstation)
Crash Team Racing (Playstation)
Metal Gear Solid (Playstation)
Bugs Bunny: Lost in Time (Playstation)
Dave Mirra Free****BMX: Maximum Remix (Playstation)
Destruction Derby 2 (Playstation)
Driver (Playstation)
Driver 2 (Playstation)
Gran Turismo (Playstation)
Gran Turismo 2 (Playstation)
Newman/Haas Racing (Playstation)
Ridge Racer Revolution (Playstation)
South Park (Playstation)
South Park: Chef's Luv Shack (Playstation)
Tekken (Playstation)
Tekken 2 (Playstation)
Tekken 3 (Playstation)
Tekken 4 (Playstation 2)
Tekken 5 (Playstation 2)
Tekken Tag Tournament (Playstation 2)
Toca World Touring Cars (Playstation)
Toca Touring Car Championship (Playstation)
Grand Theft Auto (Playstation)
Grand Theft Auto 2 (Playstation)
Grand Theft Auto: Londen 1969 (Playstation)
Grand Theft Auto 3 (Playstation 2)
Grand Theft Auto: Vice City (Playstation 2)
Grand Theft Auto: San Andreas (Playstation 2)
Grand Theft Auto: Liberty City Stories (PSP)
V-Rally (Playstation)
Black (Playstation 2)
Crash Bandicoot: The Wrath of Cortex (Playstation 2)
Moto GP 2 (Playstation 2)
Moto GP 4 (Playstation 2)
Sonic Heroes (Playstation 2)
Tour de France (Playstation 2)
Le Tour de France: Centenary Edition (Playstation 2)
Dave Mirra Free****BMX (Dreamcast)
ESPN International Track & Field (Dreamcast)
Sonic Adventure (Dreamcast)
Le Mans 24 Hours (Dreamcast)
Wacky Races (Dreamcast)
Ayrton Senna's Super Monaco GP 2 (Megadrive)
The Flintstones (Megadrive)
Tiny Toons: Buster's Hidden Treasure (Megadrive)
Virtua Racing (Megadrive)
Streets of Rage 2 (Megadrive)
Sega World Wide Soccer: Euro Edition (Dreamcast)
Sonic Adventure 2 Battle (Gamecube)
Spongebob Squarepants: Revenge of the Flying Dutchman (Gamecube)
Stuntman (Playstation 2)
Driver 3 (Playstation 2)
Metropolis Street Racer (Dreamcast)
Grand Theft Auto: Liberty City Stories (Playstation 2)
Rayman Revolution (Playstation 2)
Bully (Playstation 2)
Grand Theft Auto: Vice City Stories (PSP)
Sonic Adventure 2 (Dreamcast)
TMNT (PS2)
Golden Axe (Megadrive)
Grand Theft Auto IV (X-Box 360)

I will try to keep this list updated.

I had set up a challenge for my self on december 31st, the challenge was to complete all sonic that were released for the megadrive, before it became 2005.

Sonic The Hedgehog
Sonic The Hedgehog 2
Sonic The Hedgehog 3
Sonic & Knuckles
Sonic Spinball
Sonic 3D Flickies Island
Dr. Robotnik's Mean Bean Machine

I started a round 12.35 in the afternoon and I completed Sonic1 and Sonic2 without to much drama and with good endings. But then Spinball, the drama started in the first couple of minutes when I died already, I made it as far as the last level and then I died again. I only had one live left but got to the final boss, I took ages to defeat Robotnik but I did in the end. Next up was the Mean Bean Machine which I also completed without much trouble, the same could be said of Sonic3 and S&K which I completed with the good endings and without dying once. With less then 2 hours left I started the last game I had to complete: Sonic3D, the sonic which takes the longest to complete, but with 12 minutes to go I completed this game to and I completed my challenge.

My next challenge will be trying to complete Sonic Adventure for DC in one day.

For me it's been a bit of a Sega week, because I've been playing on my old Genesis again and yesterday I've repaired my Dreamcast. Tomorrow I will go to this store where they sell old video games and look around and see if I can find more interesting games.