Franchise timeline of Sonic the Hedgehog

The Franchise timeline of Sonic the Hedgehog is listed chronologically, and presents the universe, games, and the events which are listed in relation to the fictional universe based on the Sonic the Hedgehog series.

Note: Comics, books, and television shows are bolded, while games are italicized.

1988

 * SEGA's "AM8" studio was formed in Ota, Tokyo, Japan.

1990

 * April: A contest is organized to create a mascot/character intended to prove the capabilities of the Sega Mega Drive/Sega Genesis. The proposals were various (a bulldog, an all-American wolf, an armadillo, a rabbit, a kangaroo, and even a short, fat man in pajamas). A blue hedgehog named Sonic was chosen as the mascot for Sega. Studio AM8 of Sega starts to work on Sonic the Hedgehog and is renamed "Sonic TEAM". Ultimately, the short fat man in pajamas (who bears a slight resemblance to United States President Theodore Roosevelt) would be re-designed as the villain of the Sonic the Hedgehog series, as Doctor Robotnik, and the armadillo would be reused as Mighty the Armadillo.
 * November 7: Dreams Come True, a Japanese group, begins its tour, sponsored by Sega and Sonic.

1991

 * Early 1991: Rad Mobile, an arcade racing game published by SEGA, is released. Oddly enough, the game featured a little Sonic the Hedgehog air freshener which hung from the rear mirror. It was Sonic's first ever appearance in a game, predating even the first title of his own series.
 * June 23: Sonic the Hedgehog is released on the Sega Genesis/Mega Drive in North America and Europe.
 * July 26: Sonic the Hedgehog is released on the Sega Mega Drive in Japan.
 * October 25: Sonic the Hedgehog is released on the Sega Master System in North America, Europe and Brazil.
 * December 28: Sonic the Hedgehog is released on the Sega Game Gear in Japan.
 * December: Sonic the Hedgehog is released on the Sega Game Gear in North America and Europe.
 * Sonic Eraser is released on the Sega Mega Drive in Japan.

1992

 * August: UFO SegaSonic, an arcade game developed by Sega Mechatro, launches in Japan.
 * October 16: Sonic the Hedgehog 2 is released on the Sega Master System in Europe.
 * Miles "Tails" Prower makes his debut with Sonic the Hedgehog 2 (Master System).
 * October 25: Sonic the Hedgehog 2 is released on the Sega Master System in Brazil.
 * October 29: Sonic the Hedgehog 2 is released on the Sega Game Gear in Europe.
 * November 17: Sonic the Hedgehog 2 is released on the Sega Game Gear in North America.
 * November 21: Sonic the Hedgehog 2 for the Sega Game Gear and Sonic the Hedgehog 2 for the Sega Mega Drive launches in Japan.
 * November 24: Sonic the Hedgehog 2 is released on the Sega Genesis/Mega Drive in North America and Europe.
 * November: Sonic the Hedgehog 2 is released on the Sega Master System in North America.
 * A series of manga comics starring Sonic begins in the magazine Shogaku Yonensei.

1993

 * February: Sega sponsors a football team, and Sonic appears on the team's shirts.
 * From March 14 to November 7: Sega sponsors a Formula 1 team. Sonic appears on the cars.
 * April: A machine with Sonic popcorn appears. A mini-game is integrated to keep the user entertained during the popcorn's preparation.
 * May 29: Fleetway starts publishing Sonic the Comic in the United Kingdom.
 * May: Archie Comics begins to publish the official comic series named Sonic the Hedgehog in the United States.
 * June: SegaSonic the Hedgehog launches in Japan.
 * September 13: The Adventures of Sonic the Hedgehog, an animated cartoon series, begins to air.
 * September 18: Sonic the Hedgehog (nicknamed "SatAM"), an animated cartoon series, airs on ABC.
 * September 23: Sonic the Hedgehog CD is released on the Sega Mega-CD in Japan.
 * Metal Sonic and Amy Rose make their debut in the Sonic universe in Sonic the Hedgehog CD.
 * September: SegaSonic the Hedgehog launches in North America and Europe.
 * October 25: Sonic Chaos is released on the Sega Master System in Europe.
 * October: Sonic CD is released on the Sega Mega-CD in Europe.
 * November 15: Sonic the Hedgehog Spinball is released on the Sega Mega Drive in Europe.
 * November 19: Sonic Chaos is released on the Sega Game Gear in Japan. Sonic CD is released on the Sega CD in North America.
 * November 23: Sonic the Hedgehog Spinball (Sega Genesis) and Sonic Chaos (Sega Game Gear) launch in North America.
 * November 25: A Sonic balloon appears in Macy's Thanksgiving Day Parade. It was the first and only balloon inspired by a video game until the introduction of Pikachu in 2001.
 * November 26: Dr. Robotnik's Mean Bean Machine is released on the Sega Genesis in North America.
 * November: Sonic Chaos is released on the Sega Game Gear in Europe.
 * December 10: Sonic the Hedgehog Spinball is released on the Sega Mega Drive in Japan.
 * December: Dr. Robotnik's Mean Bean Machine is released on the Sega Game Gear in North America.
 * An arcade game for children, SegaSonic Cosmo Fighter Galaxy Patrol, launches in Japan.
 * A gene is named Sonic hedgehog after Sonic.
 * Puffin Books publishes the Sonic Adventure Gamebooks, Metal City Mayhem and Zone Rangers.
 * Virgin Books publishes the novels Sonic the Hedgehog in Robotnik's Laboratory, Sonic the Hedgehog in the Fourth Dimension and Sonic the Hedgehog and the Silicon Warriors.
 * Troll Associates publishes the novel Sonic the Hedgehog.

1994

 * January: Dr. Robotnik's Mean Bean Machine is released on the Sega Mega Drive and Sega Game Gear in Europe.
 * February 2: Sonic the Hedgehog 3 is released for the Sega Genesis in North America. Sonic the Hedgehog Boom, the soundtrack music CD to Sonic the Hedgehog CD is distributed with the game.
 * Knuckles the Echidna makes his debut with Sonic the Hedgehog 3.
 * February 24: Sonic the Hedgehog 3 is released for the Sega Mega Drive in Europe.
 * February: McDonald's distributes Sonic figurines with its Happy Meals.
 * March 18: Sonic Drift is released for the Sega Game Gear in Japan.
 * May 27: Sonic the Hedgehog 3 is released for the Sega Mega Drive in Japan.
 * July 26: Dr. Robotnik's Mean Bean Machine is released for the Sega Master System in Europe and Brazil.
 * August: Sonic the Hedgehog's Gameworld is released for the Sega Pico in Japan. Sonic the Hedgehog Spinball is released for the Sega Game Gear in Europe.
 * September: Sonic the Hedgehog Spinball (Sega Game Gear) and Tails and the Music Maker (Sega Pico) launch in North America.
 * October 17: Sonic & Knuckles is released for the Sega Genesis in North America.
 * October 18: Sonic & Knuckles is released for the Sega Mega Drive in Japan.
 * October 19: Sonic & Knuckles is released for the Sega Mega Drive in Europe. Sonic &amp; Knuckles: Sonic the Hedgehog 3, The Music of the Game, is marketed in Japan.
 * November 11: Sonic &amp; Tails 2 is released for the Sega Game Gear in Japan.
 * November: Sonic Triple Trouble is released for the Sega Game Gear in Europe and North America.
 * Fang the Sniper/Nack the Weasel debuts in Sonic Triple Trouble/Sonic & Tails 2.
 * December 7: Sonic the Hedgehog - Remix, CD of remixed techno music of the Sonic games, launches in Japan.
 * An arcade game for children, Waku Waku Sonic Patrol Car, appears in Japan.
 * Virgin Books publishes the novel Sonic the Hedgehog in Castle Robotnik.
 * Puffin Books publishes the Sonic Adventure Gamebooks, Sonic v. Zonik and The Zone Zapper.
 * Troll Associates publishes the novel Robotnik's Revenge.
 * Sirène publishes the comic book series Sonic Adventures in France.
 * Knuckles Chaotix/Sonic Crackers begins development.
 * Sonic Mars is announced for the Mega Drive/Genesis, and would have contained elements and characters from SatAM Sonic, including the Knothole Freedom Fighters. However, it is pushed to the 32X briefly, then to the Sega Saturn, where it is renamed Sonic X-treme.

1995

 * January 25: Sonic the Hedgehog Spinball is released for the Sega Master System in Europe and Latin America.
 * March 17: Sonic Drift 2 is released for the Sega Game Gear in Japan.
 * March: Sonic Drift Racing (Sonic Drift 2 in North America) is released for the Sega Game Gear in Europe.
 * April 20: Knuckles' Chaotix is released for the Sega 32X in North America.
 * Chaotix make their debut in Knuckles' Chaotix.
 * April 21: Knuckles' Chaotix is released for the Sega 32X in Japan.
 * April 28: Tails' Skypatrol is released for the Sega Game Gear in Japan.
 * May: Knuckles' Chaotix is released for the Sega 32X in Europe.
 * July: Sonic Compilation, a compilation of Sonic the Hedgehog, Sonic the Hedgehog 2, and Dr. Robotnik's Mean Bean Machine is released for the Sega Mega Drive in Europe.
 * September 22: Tails Adventures is released for the Sega Game Gear in Japan.
 * September: Tails Adventure is released for the Sega Game Gear in Europe.
 * October: Sonic 2 in 1, compilation of Sonic the Hedgehog and Sonic the Hedgehog Spinball is released for the Sega Game Gear in Europe. Sonic Labyrinth is released for the Sega Game Gear in Europe.
 * November 17: Sonic Labyrinth is released for the Sega Game Gear in Japan.
 * November: Sonic Drift 2, Sonic Labyrinth and Tails Adventure for Sega Game Gear launch in North America.
 * December 5: Tails and the Music Maker is released for the Sega Pico in Japan.
 * Puffin Books publishes the Sonic Adventure Gamebook, Theme Park Panic.
 * Troll Associates publishes the novels Fortress of Fear, Friend or Foe and Sonic &amp; Knuckles.

1996

 * May 31: Sonic the Hedgehog: The Movie, an animated series of two episodes, launches in Japan.
 * May: Sonic X-Treme is announced.
 * June: Sonic the Fighters launches in Japan. The game is arcade-only, but will see a home console release on the Sonic Gems Collection compilation.
 * July: Sonic Championship (Sonic the Fighters in Japan and Europe) launches in North America.
 * August 9: Sonic the Hedgehog CD is released on the PC in Japan.
 * August 26: Sonic CD is released on the PC in North America.
 * August: Sonic the Fighters launches in Europe.
 * October 3: Sonic CD is released on the PC in Europe.
 * November 24: Sonic Christmas Blast, an animated cartoon Christmas special airs in North America.
 * November 30: Sonic 3D Blast is released on the Sega Genesis and Sega Saturn in North America. This is the first semi-3D game in the Sonic franchise (in reality, it uses a 2.5D isometric view).
 * November: Sonic X-Treme is placed on indefinite hold (basically, canceled). The game will never be released. Sonic 3D: Flickies' Island is released on the Sega Mega Drive in Europe. Sonic the Hedgehog's Gameworld and Sonic's Schoolhouse launches respectively on Sega Pico and PC, to North America.
 * December 7: Sonic the Fighters Sound Tracks, the music of Sonic the Fighters, launches in Japan.
 * December 12: Sonic Blast is released on the Sega Game Gear in North America.
 * December 13: G Sonic (also named Sonic Blast in Europe and North America) is released on the Sega Game Gear in Japan.
 * Sonic Blast is released on the Sega Game Gear in Europe.
 * Puffin Books publishes the Sonic Adventure Gamebook, Stormin' Sonic.
 * Virtual Sonic, music CD of Sonic Spinball, Sonic the Hedgehog 3 and Sonic & Knuckles, launches in the United States.
 * Sonic the Hedgehog becomes the first video game to be added to the British National Film and Television Archive.

1997

 * February 14: Sonic the Screen Saver and Sonic & Knuckles Collection (compilation of Sonic the Hedgehog 3, Sonic & Knuckles and Sonic 3 & Knuckles) launch for PC in Japan.
 * February: Sonic 3D: Flickies' Island is released on the Sega Saturn in Europe.
 * March 20: Sonic & Knuckles Collection for PC launches in Europe and North America.
 * April: Sonic the Hedgehog AWP, an arcade game machine, launches in the United Kingdom.
 * June 20: Sonic Jam (compilation of Sonic the Hedgehog, Sonic the Hedgehog 2, Sonic the Hedgehog 3 and Sonic & Knuckles) for Sega Saturn launches in Japan.
 * July 31: Sonic Jam for Sega Saturn launches in North America.
 * August 28: Sonic Jam for Sega Saturn launches in Europe.
 * August: Sonic Classics (formerly known as Sonic Compilation) for Sega Genesis launches in the United States.
 * September 25: Sonic 3D Blast is released on the PC in North America.
 * September 30: Sonic 3D: Flickies' Island is released on the PC in Europe.
 * October 31: Sonic R is released on the Sega Saturn in North America. It is the first truly 3D Sonic game.
 * December 4: Sonic R is released on the Sega Saturn in Japan.
 * December 11: Sonic R is released on the Sega Saturn in Europe.
 * December: Sonic Blast is released on the Sega Master System in Brazil.

1998

 * January 1: Sonic Jam for Tiger Game.com launches in North America.
 * January 21: Sonic R (Music CD), launches in Japan.
 * August 22: Sega announces Sonic Adventure.
 * November 6: Sonic Team "PowerPlay", music CD of the various Sonic games, launches in Japan.
 * November 11: Sonic R is released on the PC in North America
 * November: Sonic R is released on the PC in Japan and Europe.
 * December 2: Songs with Attitude, CD of the vocal music of Sonic Adventure, launches in Japan.
 * December 16: Sonic Adventure Remix, remixed music of the vocal music, launches in Japan.
 * December 23: Sonic Adventure is released for the Dreamcast in Japan. This is Sonic's debut into full-3D realms. It is also the first official 3D Sonic game.
 * Big the Cat and E-102 Gamma make their debut into the Sonic universe with Sonic Adventure.
 * The DMCA law on the copyright is rehabilitated with the addition of 3D games. Sonic is one of the first characters to use the law.

1999

 * January 20: Digi-Log Conversation: Sonic Adventure Original Sound Track, CD of the original musics of Sonic Adventure, launches in Japan.
 * July 15: Sonic Adventure: Limited Edition, an incomplete version of the American translation of the game, starts to be distributed. This version is only incomplete from having its internet capabilities removed, when compared to the full version.
 * August 30: Sonic Underground, an animated cartoon, begins.
 * September 9: Sonic Adventure is released for the Dreamcast in North America.
 * October 14: Sonic Adventure International, an improved and international version of Sonic Adventure, launches in Japan and in Europe. Sonic 3D: Flickies' Island is released for the Sega Saturn in Japan.
 * December 20: Sonic the Hedgehog Pocket Adventure is released for the Neo Geo Pocket Color in North America.

2000

 * May 25: Sonic the Hedgehog Pocket Adventure is released for the Neo Geo Pocket Color in Japan.
 * November 13: Sonic Shuffle is released for the Dreamcast in North America.
 * December 21: Sonic Shuffle is released for the Dreamcast in Japan.
 * Sonic the Hedgehog Pocket Adventure is released for the Neo Geo Pocket Color in Europe.

2001

 * March 9: Sonic Shuffle is released for the Dreamcast in Europe.
 * June 18: Sonic Adventure 2 is released for the Dreamcast in North America.
 * Shadow the Hedgehog and Rouge the Bat make their debuts into the Sonic universe in Sonic Adventure 2.
 * June 23: The 10th Anniversary of Sonic. Sonic Adventure 2 is released for the Dreamcast in Japan and Europe.
 * June: Sonic Factory starts to sell Sonic collector's items.
 * August 22: Cuts Unleashed: Vocal SA2 Collection, CD of the sung music of Sonic Adventure 2, launches in Japan.
 * September 5: Multi-Dimensional, CD of the music of Sonic Adventure 2, launches in Japan.
 * December 20: Sonic Adventure 2: Battle (Nintendo GameCube) and Sonic Advance (Game Boy Advance) launches in Japan.
 * December 28: Corocoro Comics publishes the official second manga of Sonic.

2002

 * January 3: Sonic Adventure 2 Official Soundtrack, a selection of the musics of Sonic Adventure 2, launches in the United States.
 * February 3: Sonic Advance is released for the Game Boy Advance in North America.
 * February 11: Sonic Adventure 2: Battle is released for the Nintendo GameCube in North America.
 * March 8: Sonic Advance is released for the Game Boy Advance in Europe.
 * May 3: Sonic Adventure 2: Battle is released for the Nintendo GameCube in Europe.
 * October: Sonic & Tails Spinner, a betting game, appears in the United States.
 * November 10: Sonic Mega Collection, a collection of Sonic games, launches in North America.
 * December 19: Sonic Advance 2 (Game Boy Advance) and Sonic Mega Collection (Nintendo GameCube) launches in Japan.
 * Cream the Rabbit makes her debut into the Sonic universe in Sonic Advance 2.

2003

 * March 7: Sonic Mega Collection is released for the Nintendo GameCube in Europe.
 * March 9: Sonic Advance 2 is released for the Game Boy Advance in North America.
 * March 28: Sonic Advance 2 is released for the Game Boy Advance in Europe.
 * April 6: Sonic X, an anime series, starts in Japan.
 * June 1: Sonic Pinball Party is released for the Game Boy Advance in North America.
 * June 18: Sonic Adventure DX: Director's Cut is released for the Nintendo GameCube in North America.
 * June 19: Sonic Adventure DX: Director's Cut is released for the Nintendo GameCube in Japan.
 * June 27: Sonic Adventure DX: Director's Cut is released for the Nintendo GameCube in Europe.
 * June: McDonald's launches their second series of Sonic toys.
 * July 17: Sonic Pinball Party is released for the Game Boy Advance in Japan.
 * August 23: Sonic X, an anime series, starts in North America.
 * October 6: Sonic N is released for the Nokia N-Gage in North America.
 * October 7: Sonic N is released for the Nokia N-Gage in Europe.
 * October 31: Sonic Pinball Party is released for the Game Boy Advance in Europe.
 * December: CR Sonic, pachinko machine, launches in Japan.
 * December 4: Sonic Battle is released for the Game Boy Advance in Japan.
 * December 18: Sonic Adventure DX: Director's Cut is released for the Microsoft Windows in Japan.
 * December 30: Sonic Heroes is released for the Nintendo GameCube, PlayStation 2 and Xbox in Japan.
 * E-123 Omega debuts in Sonic Heroes.

2004

 * January 5: Sonic Battle launches in North America, to Target stores, only. This renders the game as a United States-only game, as Mexico and Canada do not have Target stores. Sonic Heroes is released for the Nintendo GameCube in North America.
 * January 27: Sonic Heroes is released for the PlayStation 2 and Xbox in North America.
 * February 4: Triple Threat: Sonic Heroes Vocal Trax, CD of the sung music of Sonic Adventure and Sonic Heroes, launches in Japan.
 * February 6: Sonic Heroes is released for the Nintendo GameCube, PlayStation 2 and Xbox in Europe and Australia. Sonic Adventure DX: Director's Cut is released for the Microsoft Windows in Europe.
 * February 27: Sonic Battle is released for the Game Boy Advance in Europe.
 * March 3: Complete Trinity: Sonic Heroes Original Soundtrax, soundtrack of Sonic Heroes, launches in Japan.
 * June 7: Sonic Advance 3 is released for the Game Boy Advance in North America.
 * June 17: Sonic Advance 3 is released for the Game Boy Advance in Japan.
 * June 18: Sonic Advance 3 is released for the Game Boy Advance in Europe.
 * August 26: SonicTeam Unplugged Live 2004, CD of six songs coming from various Sonic games, launches in Japan.
 * September 14: Sonic Adventure DX: Director's Cut is released for the Microsoft Windows in North America.
 * October 22: Sega Superstars is released for the PlayStation 2 in Europe.
 * November 2: Sonic Mega Collection Plus for the PlayStation 2 and Xbox launches in North America.
 * November 3: Sega Superstars is released for the PlayStation 2 in North America.
 * November 11: Sega Superstars is released for the PlayStation 2 in Japan.
 * November 17: Sonic Heroes is released for the Microsoft Windows in North America.
 * November 26: Sonic Heroes is released for the Microsoft Windows in Europe.
 * November: Sonic Heroes Official Soundtrack, music CD of Sonic Heroes, launches in North America.
 * December 9: Sonic Mega Collection Plus (PlayStation 2 and Xbox) and Sonic Heroes (PC) launches in Japan.
 * December: McDonald's launches another series of Sonic toys.

2005

 * February 4: Sonic Mega Collection Plus for the PlayStation 2 and Xbox launches in Europe.
 * March 8: Sonic is one of the first three heroes to be honored in the Walk of Game.
 * March 20: Sonic Mega Collection Plus for the PlayStation 2 and Xbox launches in Australia.
 * August 11: Sonic Gems Collection is released for the Nintendo GameCube and PlayStation 2 in Japan.
 * August 16: Sonic Gems Collection is released for the Nintendo GameCube in North America.
 * September 30: Sonic Gems Collection is released for the Nintendo GameCube and PlayStation 2 in Europe.
 * November 15: Shadow the Hedgehog (Xbox, PlayStation 2 and Nintendo GameCube) and Sonic Rush (Nintendo DS) launches in North America.
 * Blaze the Cat and Eggman Nega make their debuts into the Sonic Universe in Sonic Rush.
 * November 18: Shadow the Hedgehog (Xbox, PlayStation 2 and Nintendo GameCube) and Sonic Rush (Nintendo DS) launches in Europe.
 * November 23: Sonic Rush is released on the Nintendo DS in Japan.
 * December 15: Shadow the Hedgehog is released on the Xbox, PlayStation 2 and Nintendo GameCube in Japan.

2006

 * February 21: Sonic Riders is released on Xbox, PlayStation 2 and Nintendo GameCube in North America.
 * Jet the Hawk, Wave the Swallow and Storm the Albatross, the members of the Babylon Rogues, make their debut into the Sonic Universe in Sonic Riders.
 * February 23: Sonic Riders is released on Xbox, PlayStation 2 and Nintendo GameCube in Japan.
 * March 17: Sonic Riders is released on Xbox, PlayStation 2 and Nintendo GameCube in Europe.
 * March 30: Sonic Riders is released on Xbox, PlayStation 2 and Nintendo GameCube in Australia.
 * March 31: Sonic Mega Collection Plus is released on PC in Europe.
 * November 14: Sonic the Hedgehog 2006 is released on the Xbox 360 in North America as the 15th Anniversary of Sonic.
 * Silver the Hedgehog makes his debut into the Sonic universe in Sonic the Hedgehog 2006.
 * November 16: Sonic the Hedgehog Genesis is released on the Game Boy Advance in North America.
 * November 17: Sonic Riders is released on PC in North America.
 * November 19: Sonic the Hedgehog (1991) is re-released on the Wii Virtual Console in North America.
 * November 24: Sonic Rivals is released on the PlayStation Portable in North America. Sonic Riders (PC) and Sonic the Hedgehog 2006 (Xbox 360) is released in Europe.
 * November 30: Sonic the Hedgehog 2006 is released on the Xbox 360 in Australia.
 * December 1: Sonic Rivals is released on the PlayStation Portable in Europe.
 * December 2: Sonic the Hedgehog (1991) is re-released on the Wii Virtual Console in Japan.
 * December 7: Sonic Rivals is released on the PlayStation Portable in Australia.
 * December 8: Sonic the Hedgehog (1991) and Dr. Robotnik's Mean Bean Machine is re-released on the Wii Virtual Console in Europe.
 * December 11: Dr. Robotnik's Mean Bean Machine is re-released on the Wii Virtual Console in North America.
 * December 21: Sonic the Hedgehog 2006 is released on the Xbox 360 and PlayStation 3 in Japan.

2007

 * January 30: Sonic the Hedgehog 2006 is released on the PlayStation 3 in North America.
 * February 20: Sonic and the Secret Rings is released on Wii in North America.
 * March 2: Sonic and the Secret Rings is released on Wii in Europe.
 * March 8: Sonic and the Secret Rings is released on Wii in Australia.
 * March 9: Sonic Mega Collection Plus is released on PC in North America.
 * March 12: Sonic the Hedgehog Spinball is re-released on the Wii Virtual Console in North America.
 * March 13: Sonic the Hedgehog Spinball is re-released on the Wii Virtual Console in Japan.
 * March 15: Sonic and the Secret Rings is released on Wii in Japan.
 * March 23: Sonic the Hedgehog 2006 is released on the PlayStation 3 in Europe and Australia.
 * March 29: Sonic Riders is released on PC in Australia.
 * April 5: Sonic the Hedgehog Spinball is re-released on the Wii Virtual Console in Europe.
 * April 6: Sonic the Hedgehog Spinball is re-released on the Wii Virtual Console in Australia.
 * June 11: Sonic the Hedgehog 2 is re-released on the Wii Virtual Console in North America.
 * June 19: Sonic the Hedgehog 2 is re-released on the Wii Virtual Console in Japan.
 * July 6: Sonic the Hedgehog 2 is re-released on the Wii Virtual Console in Europe.
 * July 11: Sonic the Hedgehog (1991) is re-released on the Xbox Live Arcade.
 * August 21: Sonic the Hedgehog 3 is re-released on the Wii Virtual Console in Japan.
 * September 7: Sonic the Hedgehog 3 is re-released on the Wii Virtual Console in Europe.
 * September 10: Sonic the Hedgehog 3 is re-released on the Wii Virtual Console in North America.
 * September 12: Sonic the Hedgehog 2 is re-released on the Xbox Live Arcade.
 * September 14: Sonic Rush Adventure is released on the Nintendo DS in Europe.
 * Marine the Raccoon maker her debut into the Sonic universe in Sonic Rush Adventure.
 * September 18: Sonic Rush Adventure is released on the Nintendo DS in North America.
 * September 27: Sonic Rush Adventure is released on the Nintendo DS in Australia.
 * October 16: Sonic 3D Blast is re-released on the Wii Virtual Console in Japan.
 * October 18: Sonic Rush Adventure is released for the Nintendo DS in Japan.
 * November 2: Sonic 3D: Flickies' Island is re-released on the Wii Virtual Console in Europe.
 * November 6: Mario & Sonic at the Olympic Games is released in North America for the Wii.
 * November 13: Sonic Rivals 2 is released on the PlayStation Portable in North America.
 * November 19: Sonic 3D Blast is re-released on the Wii Virtual Console in North America.
 * November 22: Mario & Sonic at the Olympic Games is released on the Wii in Japan and Australia.
 * November 23: Mario & Sonic at the Olympic Games is released on the Wii in Europe.
 * December 6: Sonic Rivals 2 is released on the PlayStation Portable in Australia.
 * December 7: Sonic Rivals 2 is released on the PlayStation Portable in Europe.
 * December 18: Sonic the Hedgehog (1991) is re-released on the iPod.

2008

 * January 8: Sonic Riders: Zero Gravity is released for the PlayStation 2 and Wii in North America.
 * January 17: Mario & Sonic at the Olympic Games (Nintendo DS) and Sonic Riders: Zero Gravity (Wii) launches in Japan.
 * January 22: Mario & Sonic at the Olympic Games is released on the Nintendo DS in North America.
 * January 31: Super Smash Bros. Brawl is released for the Wii in Japan, with Sonic as a playable character.
 * February 7: Mario & Sonic at the Olympic Games is released on the Nintendo DS in Australia.
 * February 8: Mario & Sonic at the Olympic Games is released on the Nintendo DS in Europe.
 * February 22: Sonic Riders: Zero Gravity is released for the PlayStation 2 and Wii in Europe.
 * March 6: Sonic Riders: Zero Gravity is released for the PlayStation 2 and Wii in Australia.
 * March 9: Super Smash Bros. Brawl is released for the Wii in North America.
 * March 18: Sega Superstars Tennis is released for the PlayStation 2, PlayStation 3, Xbox 360, Wii and Nintendo DS in North America, with Sonic, Tails, Amy, Shadow and Dr. Eggman as playable characters and multiple courts and games based off the Sonic franchise.
 * March 20: Sega Superstars Tennis is released for the PlayStation 2, PlayStation 3, Xbox 360, Wii and Nintendo DS in Europe.
 * March 27: Sega Superstars Tennis is released for the PlayStation 2, PlayStation 3, Xbox 360, Wii and Nintendo DS in Australia.
 * June 26: Super Smash Bros. Brawl is released for the Wii in Australia.
 * June 27: Super Smash Bros. Brawl is released for the Wii in Europe.
 * August 4: Sonic the Hedgehog (8-bit) is re-released on the Wii Virtual Console in North America.
 * August 5: Sonic the Hedgehog (8-bit) is re-released on the Wii Virtual Console in Japan.
 * August 19: Sonic the Hedgehog (8-bit) is re-released on the Wii Virtual Console in Europe and Australia.
 * September 25: Sonic Chronicles: The Dark Brotherhood is released for the Nintendo DS in Australia.
 * September 26: Sonic Chronicles: The Dark Brotherhood is released for the Nintendo DS in Europe.
 * September 30: Sonic Chronicles: The Dark Brotherhood is released for the Nintendo DS in North America.
 * November 18: Sonic Unleashed is released for the PlayStation 2 and Wii in North America. Sonic the Hedgehog 2 (8-bit) is re-released on the Wii Virtual Console in Japan.
 * Sonic the Werehog, Sonic's new beast form generated by the corrupted Chaos Emeralds, makes his debut in Sonic Unleashed.
 * November 20: Sonic Unleashed is released for the Xbox 360 in North America.
 * November 27: Sonic Unleashed is released for the PlayStation 2, Wii and Xbox 360 in Australia.
 * November 28: Sonic Unleashed is released for the PlayStation 2, Wii and Xbox 360 in Europe.
 * December 8: Sonic the Hedgehog 2 (8-bit) is re-released on the Wii Virtual Console in North America.
 * December 9: Sonic Unleashed is released for the PlayStation 3 in North America.
 * December 18: Sonic Unleashed is released for the Wii in Japan and for the PlayStation 3 in Australia.
 * December 19: Sonic Unleashed is released for the PlayStation 3 in Europe.
 * December 26: Sonic the Hedgehog 2 (8-bit) is re-released on the Wii Virtual Console in Europe.

2009

 * February 2: Sonic Chaos is re-released on the Wii Virtual Console in North America.
 * February 6: Sonic Chaos is re-released on the Wii Virtual Console in Europe.
 * February 10: Sonic's Ultimate Genesis Collection is released for the PlayStation 3 and Xbox 360 in North America.
 * February 19: Sonic Unleashed is released for the Xbox 360 and PlayStation 3 in Japan.
 * February 20: Sega Mega Drive Ultimate Collection is released for the PlayStation 3 and Xbox 360 in Europe and Australia.
 * March 3: Sonic and the Black Knight is released for the Wii in North America.
 * March 12: Sonic and the Black Knight is released for the Wii in Japan and Australia.
 * March 13: Sonic and the Black Knight is released for the Wii in Europe.
 * March 17: Sonic Chaos is re-released on the Wii Virtual Console in Japan.
 * May 20: Sonic the Hedgehog (1991) is re-released on the iPhone.
 * June 10: Sonic the Hedgehog 3 is re-released on the Xbox Live Arcade.
 * August 6: Sonic Chronicles: The Dark Brotherhood is released for the Nintendo DS in Japan.
 * August 21: Sonic the Hedgehog (1991) is re-released on the BlackBerry.
 * August 25: Sonic Unleashed is released on the cell phone.
 * September 9: Sonic & Knuckles is re-released on the Xbox Live Arcade.
 * September 17: Sonic Rush Adventure is released for the Nintendo DS in South Korea.
 * October 13: Mario & Sonic at the Olympic Winter Games is released for the Wii and Nintendo DS in North America.
 * October 15: Mario & Sonic at the Olympic Winter Games is released for the Wii and Nintendo DS in Australia.
 * October 16: Mario & Sonic at the Olympic Winter Games is released for the Wii and Nintendo DS in Europe.
 * November 5: Mario & Sonic at the Olympic Winter Games is released for the Wii and Nintendo DS in Japan.

2010

 * January 29: Sonic at the Olympic Winter Games is released on the iPhone / iPod Touch / iPad.
 * February 23: Sonic & Sega All-Stars Racing is released for the Xbox 360, PlayStation 3, Microsoft Windows, Wii and Nintendo DS in North America.
 * February 26: Sonic & Sega All-Stars Racing is released for the Xbox 360, PlayStation 3, Microsoft Windows, Wii and Nintendo DS in Europe.
 * March 3: Sonic Classic Collection is released for the Nintendo DS in North America.
 * March 4: Sonic & Sega All-Stars Racing is released for the Xbox 360, PlayStation 3, Microsoft Windows, Wii and Nintendo DS in Australia.
 * March 11: Sonic Classic Collection is released for the Nintendo DS in Australia.
 * March 12: Sonic Classic Collection is released for the Nintendo DS in Europe.
 * April 20 Sonic the Hedgehog 2 is re-released on the iPhone / iPod Touch / iPad.
 * June 1: Sonic 3D Blast is re-released on the Microsoft Windows (Steam).
 * September 13: Sonic the Hedgehog Spinball and Dr. Robotnik's Mean Bean Machine is re-released on the Microsoft Windows (Steam).
 * September 15: Sonic Adventure is re-released for the Xbox Live Arcade in North America and Europe.
 * September 21: Sonic Adventure is re-released for the PlayStation Network in North America and Europe.
 * September 22: Sonic Adventure is re-released for the PlayStation Network in Australia.
 * September 29: Sonic Adventure is re-released for the PlayStation Network in Japan, and Xbox Live Arcade in Japan and Australia.
 * October 7: Sonic the Hedgehog 4: Episode I is released for the iPhone / iPod Touch / iPad.
 * October 11: Sonic the Hedgehog 4: Episode I is released for the WiiWare in North America.
 * October 12: Sonic the Hedgehog 4: Episode I is released for the PlayStation Network in North America and Japan and for the WiiWare in Japan.
 * October 13: Sonic the Hedgehog 4: Episode I is released for the PlayStation Network (only in Europe and Australia) and Xbox Live Arcade.
 * October 15: Sonic the Hedgehog 4: Episode I is released for the WiiWare in Europe and Australia.
 * October 26: Sonic the Hedgehog (1991) is re-released on the Windows (Steam).
 * November 4: Sonic Free Riders is released for the Xbox 360 in North America.
 * November 10: Sonic Free Riders is released for the Xbox 360 in Europe.
 * November 11: Sonic Colors is released for the Wii and Nintendo DS in Australia.
 * November 12: Sonic Colors is released for the Wii and Nintendo DS in Europe.
 * November 16: Sonic Colors is released for the Wii and Nintendo DS in North America.
 * November 18: Sonic Colors is released for the Wii and Nintendo DS in Japan. Sonic Free Riders is released for the Xbox 360 in Australia.
 * November 20: Sonic Free Riders is released for the Xbox 360 in Japan.
 * December 16: Sonic the Hedgehog Spinball is re-released on the iPhone / iPod Touch / iPad.

2011

 * January 26: Sonic 3 & Knuckles is re-released on the Microsoft Windows (Steam).
 * March 2: Sonic the Hedgehog (1991) is re-released on the PlayStation Network in Europe.
 * March 4: Sonic Adventure DX: Director's Cut is re-released for the Microsoft Windows (Steam).
 * March 29: Sonic the Hedgehog (1991) is re-released on the PlayStation Network in North America.
 * April 19: Sonic the Hedgehog 2 is re-released on the PlayStation Network in North America.
 * April 20: Sonic the Hedgehog 2 is re-released on the PlayStation Network in Europe.
 * June 15: Sonic the Hedgehog 4: Episode I is released for the Windows Phone 7.
 * June 23: Sega and Sonic Team were celebrating Sonic's 20th Anniversary. Sonic & Sega All-Stars Racing is released for the iPhone / iPod Touch / iPad.
 * July 28: Sonic the Hedgehog 2 is re-released on the PlayStation Network in Japan.
 * November 1: Sonic Generations is released for the Xbox 360 and PlayStation 3 in North America.
 * November 3: Sonic Generations is released for the Xbox 360 and PlayStation 3 in Australia.
 * November 4: Sonic Generations is released for the Xbox 360 and PlayStation 3 (only in Europe) and Microsoft Windows (Steam).
 * November 15: Mario & Sonic at the London 2012 Olympic Games is released for the Wii in North America.
 * November 17: Mario & Sonic at the London 2012 Olympic Games is released for the Wii in Australia.
 * November 18: Mario & Sonic at the London 2012 Olympic Games is released for the Wii in Europe.
 * November 22: Sonic Generations is released for the Nintendo 3DS in North America.
 * November 24: Sonic Generations is released for the Nintendo 3DS in Australia.
 * November 25: Sonic Generations is released for the Nintendo 3DS in Europe. Sonic Advance is released for the Android in Japan.
 * December 1: Sonic Generations is released for the Xbox 360, PlayStation 3 and Nintendo 3DS in Japan.
 * December 8: Mario & Sonic at the London 2012 Olympic Games is released for the Wii in Japan.
 * December 14: Sonic CD is re-released for the PlayStation Network (only in Europe), Xbox Live Arcade and Android.
 * December 15: Sonic CD is re-released for the iPhone / iPod Touch / iPad.
 * December 20: Sonic CD is re-released for the PlayStation Network in North America.

2012

 * January 11: Sonic the Hedgehog features in the Progressive Local Agent commercial.
 * January 19: Sonic the Hedgehog 4: Episode I is released for the Microsoft Windows (Steam).
 * January 25: Sonic the Hedgehog 4: Episode I is released for the Android.
 * February 9: Mario & Sonic at the London 2012 Olympic Games is released for the Nintendo 3DS in Australia.
 * February 10: Mario & Sonic at the London 2012 Olympic Games is released for the Nintendo 3DS in Europe.
 * February 14: Mario & Sonic at the London 2012 Olympic Games is released for the Nintendo 3DS in North America.
 * February 22: Sonic Heroes is re-released for the PlayStation Network exclusively in Europe.
 * March 1: Mario & Sonic at the London 2012 Olympic Games is released for the Nintendo 3DS in Japan.
 * March 14: Sonic Triple Trouble is re-released for the Nintendo 3DS Virtual Console in Japan.
 * March 15: Sonic Triple Trouble is re-released for the Nintendo 3DS Virtual Console in North America.
 * March 29: Sonic Triple Trouble is re-released for the Nintendo 3DS Virtual Console in Europe and Australia.
 * April 18: G Sonic is re-released for the Nintendo 3DS Virtual Console in Japan.
 * May 10: Sonic Labyrinth is re-released for the Nintendo 3DS Virtual Console in Europe and Australia.
 * May 15: Sonic the Hedgehog 4: Episode II is released for the PlayStation Network (only in North America) and Microsoft Windows (Steam).
 * It also contains the extra episode to unlock, Sonic the Hedgehog 4: Episode Metal.
 * May 16: Sonic the Hedgehog 4: Episode II is released for the PlayStation Network (only in Europe and Japan) and Xbox Live Arcade. Sonic Labyrinth is re-released for the Nintendo 3DS Virtual Console in Japan.
 * May 17: Sonic the Hedgehog 4: Episode II is released for the iPhone / iPod Touch / iPad.
 * June 14: Sonic Blast is re-released for the Nintendo 3DS Virtual Console in Europe and Australia.
 * June 25: Sonic the Hedgehog 4: Episode II is released for Android.
 * October 2: Sonic Adventure 2 is re-released for the PlayStation Network in North America.
 * October 3: Sonic Adventure 2 is re-released for the PlayStation Network in Europe.
 * October 4: Sonic Adventure 2 is re-released for the PlayStation Network in Japan.
 * October 5: Sonic Adventure 2 is re-released for the Xbox Live Arcade.
 * October 18: Sonic Jump is released for the iPhone / iPod Touch / iPad.
 * October 31: Sonic the Hedgehog (8-bit) is re-released on the Nintendo 3DS Virtual Console in Japan.
 * November 2: Disney's Wreck-It Ralph is released in theaters. Having Sonic and Dr. Eggman making cameos in the film (in which Roger Craig Smith voiced Sonic only). Until for this, Wreck-It Ralph is set to join Sonic, his friends and the Sega All-Stars in Sonic & All-Stars Racing Transformed.
 * November 14: Sonic CD is re-released for Windows Phone 7. Sonic Drift 2 is re-released for the Nintendo 3DS Virtual Console in Japan.
 * November 15: Sonic & All-Stars Racing Transformed is released for the Xbox 360 and PlayStation 3 in Australia.
 * November 16: Sonic & All-Stars Racing Transformed is released for the Xbox 360 and PlayStation 3 in Europe.
 * November 18: Sonic & All-Stars Racing Transformed is released for the Xbox 360, PlayStation 3 and Wii U in North America.
 * November 19: Sonic Adventure 2 is re-released for the Microsoft Windows (Steam).
 * November 27: Sonic the Fighters is re-released for the PlayStation Network in North America.
 * November 28: Sonic the Fighters is re-released for the PlayStation Network (only in Japan) and Xbox Live Arcade.
 * November 30: Sonic & All-Stars Racing Transformed is released for the Wii U in Europe and Australia.
 * December 5: Sonic the Fighters is re-released for the PlayStation Network in Europe.
 * December 7: Sonic & All-Stars Racing Transformed is released for the PlayStation Vita in Europe.
 * December 18: Sonic & All-Stars Racing Transformed is released for the PlayStation Vita in North America.
 * December 21: Sonic Jump is released for the Android.

2013

 * January 31: Sonic & All-Stars Racing Transformed is released for Microsoft Windows.
 * February 8: Sonic & All-Stars Racing Transformed is released for the Nintendo 3DS in Europe.
 * February 12: Sonic & All-Stars Racing Transformed is released for the Nintendo 3DS in North America.
 * March 7: Sonic Dash is released for the iPhone / iPod Touch / iPad.
 * April 3: Tails Adventures is re-released on the Nintendo 3DS Virtual Console in Japan.
 * April 4: Sonic & Sega All-Stars Racing is released for the Mac OS X.
 * April 25: Sonic Athletics is released in Japan as an arcade game.
 * May 15: 3D Sonic the Hedgehog is released on the Nintendo 3DS eShop in Japan.
 * May 16: Sonic the Hedgehog (1991) is re-released for the iPhone / iPod Touch / iPad and Android. Now with enhanced performance, graphics and sound; plus two new playable characters, Tails and Knuckles.
 * June 13: Sonic the Hedgehog (8-bit) and Dr. Robotnik's Mean Bean Machine is re-released on the Nintendo 3DS Virtual Console.
 * June 19: Shadow the Hedgehog is re-released for the PlayStation Network in Japan.
 * June 20: Sonic Blast is re-released for the Nintendo 3DS Virtual Console in North America. Tails Adventure is re-released for the Nintendo 3DS Virtual Console in Europe, North America and Australia.
 * June 27: Sonic Labyrinth is re-released for the Nintendo 3DS Virtual Console in North America.
 * July 4: Sonic Drift 2 is re-released for the Nintendo 3DS Virtual Console in Europe, North America and Australia.
 * July 8: Sonic the Hedgehog 4: Episode I and Sonic the Hedgehog 4: Episode II is released for the Ouya.
 * July 27: Sonic Ghost Shooting releases in Japan as arcade game.
 * July 31: Sonic the Hedgehog 4: Episode II is released for the Nvidia Shield.
 * August 1: Sonic CD is re-released on the Ouya.
 * September 19: Sonic & Sega All-Stars Racing is released on the Android.
 * October 17: Sega Superstars Tennis is released for the OS X.
 * October 18: Sonic Lost World is released for the Wii U and Nintendo 3DS in Europe.
 * October 19: Sonic Lost World is released for the Wii U and Nintendo 3DS in Australia.
 * October 24: Sonic Lost World is released for the Wii U and Nintendo 3DS in Japan.
 * October 29: Sonic Lost World is released for the Wii U and Nintendo 3DS in North America.
 * November 8: Mario & Sonic at the Sochi 2014 Olympic Winter Games is released for the Wii U in Europe.
 * November 9: Mario & Sonic at the Sochi 2014 Olympic Winter Games is released for the Wii U in Australia.
 * November 15: Mario & Sonic at the Sochi 2014 Olympic Winter Games is released for the Wii U in North America.
 * November 26: Sonic Dash is released for Android devices
 * November: Sonic the Hedgehog 2 is re-released on the iOS and Android. Sonic Brain Ranking releases in Japan as arcade game.
 * December 5: Mario & Sonic at the Sochi 2014 Olympic Winter Games is released for the Wii U in Japan. 3D Sonic the Hedgehog is released on the Nintendo 3DS eShop in North America, Europe and Australia.
 * December: Sonic & All-Stars Racing Transformed is released for the iOS and Android.

2014

 * Fall: Sonic Boom, an animated cartoon series, begins to air.
 * Super Smash Bros. for Nintendo 3DS and Wii U