Complete Sonic Game List
The list credit goes to Neo Matrix, Moderator on the GameWinners forum. Thanks for doing that hard part, bud! If anyone sees any mistakes and is a pro at the games, please let us know. This list contains all games with Sonic as a character or with Sonic related material (i.e.: Dr. Robotnik's Mean Bean Machine). I spent forever digging up this great list, so enjoy! Please give Neo Matrix credit if this is used!
Full-Fledged Sonic Games
Sonic the Hedgehog (Mega Drive 1991)
Sonic the Hedgehog (Master System/Game Gear 1991, only minor differences between the two)
Sonic the Hedgehog 2 (Master System/Game Gear 1992)
Segasonic the Hedgehog (Arcade 1993, Isometric 3-player game only released in Japan)
Sonic (the Hedgehog) CD (Mega CD 1993/PC 1996, The PC version has the full introduction)
Sonic the Hedgehog Chaos (Master System/Game Gear 1993, known as Sonic & Tails in Japan)
Sonic the Hedgehog Spinball (Mega Drive 1993, Game Gear/Master System 1994-1995)
Sonic the Hedgehog 3 (Mega Drive 1994)
Sonic & Knuckles (Mega Drive 1994, also known as the second half of Sonic 3)
Sonic the Hedgehog Triple Trouble (Game Gear 1994, known as Sonic & Tails 2 in Japan)
Sonic 3D Blast (Mega Drive/Saturn 1996, released as Sonic 3D: Flickies' Island in Europe in 1996 on the Mega Drive and 1997 on the Saturn, US and European release in 1997, Japanese release on the Saturn in 1999)
G Sonic (Game Gear 1996, released as Sonic Blast on the Master System in 1997)
Sonic Adventure (Dreamcast 1998, the released way too early and therefore buggy Japanese version)
Sonic Adventure: Limited Edition (Dreamcast 1999, incomplete rental version available in the US)
Sonic Adventure International (Dreamcast 1999, the Sonic Adventure everyone outside Japan knows, decidedly less buggy after 7 months extra work)
Sonic the Hedgehog Pocket Adventure (NeoGeo Pocket Color 1999-2000)
Sonic Adventure 2 (Dreamcast 2001)
Sonic Adventure 2 Battle (Gamecube 2001-2002, enhanced version of the original including extra 2-player features)
Sonic Advance (Gameboy Advance 2001-2002, almost a sequel to Pocket Adventure, it was ported to the N-Gage under the name SonicN in 2003)
Sonic Advance 2 (Gameboy Advance 2002-2003)
Sonic Adventure DX (Gamecube/PC 2003, port of the Dreamcast original, with all 12 Game Gear games to be unlocked)
Sonic N (N-Gage 2003, same as Sonic Advance with no chao garden and on smaller screen)
Sonic Battle (Gameboy Advance 2003-2004)
Sonic Heroes (Gamecube/X-Box/PS2, 2003)
Sonic Advance 3 (Gameboy Advance 2004)
Sonic Rush (Nintendo DS, Features New Character Blaze The Cat, 2005)
Sonic Riders (Gamecube/PS2/Xbox, 2006)
Sonic Rivals (Playstation Portable, 2006)
Sonic The Hedgehog (xBox360/PS3, 2006)
Sonic and the Secret Ring (Wii, 2007)
Contains Sonic Characters
Flicky (Arcade/Mega Drive/mobile phones 1984)
Dynamite Dux (Arcade/Sinclair ZX Spectrum/Atari ST/Commodore Amiga/Commodore 64/Amstrad CPC/Master System 1998, Bean the Dynamite from Sonic the Fighters' was directly inspired by Dynamite Dux)
Sonic Eraser (Mega Drive via Mega Modem 1991, Japan only, Sonic features in a Puyo/Columns hybrid)
Waku Waku Sonic Patrol Car (Arcade 1993, a children's ride-on machine with a Chase HQ-style mini-game)
Sega Sonic Popcorn Shop (Arcade 1993, combination popcorn machine and mini-game)
Sega Sonic Cosmo Fighter Galaxy Patrol (Arcade 1993, a children's ride-on machine with a 2D shooter mini-game)
Dr. Robotnik's Mean Bean Machine (Mega Drive/Game Gear/Master System 1993-1994, a modified version of the Arcade -> Mega Drive port of Puyo Puyo, by the same developer)
Sonic the Hedgehog Gameworld (Sega Pico 1994, got it's US release in 1996 with the casino-themed games taken out)
Tails and the Music Maker (Sega Pico 1994)
Sonic Drift (Game Gear 1994)
Tails' Skypatrol (Game Gear 1995, only released in Japan but as a mini game in Sonic Adventure DX)
Tails Adventure (Game Gear 1995, known as Tails Adventures in Japan)
Sonic Labyrinth (Game Gear 1995)
Knuckles' Chaotix (32X 1995, originally supposed to be Sonic 4 on the Mega Drive, was ported to the 32X and Knuckles given the starring role. Just known as Chaotix in Japan)
Sonic Drift 2 (Game Gear 1995, known as Sonic Drift Racing in Europe)
Sonic Championship (Arcade 1996, called Sonic the Fighters in Japan, never released in Europe)
Sonic's Schoolhouse (PC 1996, only released in North America)
Sonic R (Saturn 1997, PC 1998)
Sonic Shuffle (Dreamcast 2001)
Billy Hatcher And The Giant Egg (Gamecube 2003, contained eggs with Sonic's picture; optional partners are Sonic, Tails, and Knuckles)
Sonic Pinball Party (Gameboy Advance 2003)
Shadow the Hedgehog (Gamecube, PS2, Xbox 2005, featured Shadow and his story with all other characters making cameo appearances)
Collection Games
Sonic Compilation (Mega Drive 1995, Sonic 1, 2 and Mean Bean Machine, released as Sonic Classics in the US in 1997)
Sonic 2 in 1 (Game Gear 1995, Sonic 2 and Spinball, Europe only)
Sonic & Knuckles Collection (PC 1997, Sonic 3, Sonic & Knuckles and Sonic 3 & Knuckles)
Sonic Jam (Saturn 1997, Sonics 1-3 and Sonic & Knuckles, includes difficulty levels, and full S&K lock-in games, the Tiger Game.com version released in 1998 has stages from Sonics 2, 3 and Knuckles and includes Sonic, Tails, and Knuckles as playable characters)
Sonic Mega Collection (Gamecube 2002-2003, Sonics 1-3, Sonic & Knuckles including the lock-in games, Spinball, 3D Blast, Dr. Robotnik's Mean Bean Machine, Flicky and Ristar. The Japanese version included Comix Zone and The Ooze)
Sonic Mega Collection Plus (Xbox only, 2004)
Sonic Gems (Gamecube 2005, included Sonic CD, Sonic Fighters, Sonic R, and other classics)