Anniversaries

This is a cumulative info storing area for the Selected Anniversaries part of the main page. Feel free to add any dates.

January

• Jan. 1, 1996 - Club Saturn soundtrack is released in Europe.
• Jan. 3, 1999 - Sonic Underground begins its syndicated run in France.
• Jan. 5, 2004 - Sonic Heroes is released in North America for the Nintendo GameCube.
• Jan. 8, 2008 - Sonic Riders: Zero Gravity is released in North America for the Sony PlayStation 2 and the Nintendo Wii.
• Jan. 11, 2000 - Sonic the Hedgehog Pocket Adventure is released in Japan for the Neo Geo Pocket Color.
• Jan. 12, 2004 - Sonic Battle is released in North America for the Game Boy Advance.
• Jan. 17, 2008 - Sonic Riders: Zero Gravity is released in Japan as Sonic Riders: Shooting Star Story for the Nintendo Wii. In addition, Mario & Sonic at the Olympic Games is released in Japan for the Nintendo DS.
• Jan. 20, 1999 - Sonic Adventure OST is released in Japan.
• Jan. 21, 1998 - Sonic R (album), the official soundtrack of Sonic R, is released in Japan.
• Jan. 25, 1995 - Sonic Spinball (8-bit) is released in Europe and Brazil for the Sega Master System.
• Jan. 27, 2004 - Sonic Heroes is released in North America for the Sony PlayStation 2 and Microsoft Xbox.
• Jan. 30, 2007 - Sonic the Hedgehog (2006) is released in North America for the PlayStation 3.

Februrary

• Feb. 1, 2015 - The Sonic the Hedgehog amiibo is released in North America.
• Feb. 2, 1994 - Sonic the Hedgehog 3 is released in North America for the Sega Mega Drive. Groundhog day is redubbed "Hedgehog Day." In addition, Sonic the Hedgehog Boom, a Sonic CD and Sonic Spinball soundtrack, is released.
• Feb. 3, 2002 - Sonic Advance is released in North America for the Game Boy Advance.
• Feb. 4, 2004 - Triple Threat: Sonic Heroes Vocal Trax, a music CD containing the vocal songs from Sonic Heroes and Sonic Adventure, is released in Japan. In addition, Sonic X begins its syndicated run on CiTV, a British children's network.
• Feb. 4, 2005 - Sonic Mega Collection Plus is released in Europe for the PlayStation 2 and Microsoft Xbox. In addition, Sonic Heroes is released in Poland for the PC.
• Feb. 5, 2004 - Sonic Heroes is released in Germany to all 128-bit era consoles, excluding the Sega Dreamcast. In addition, Sonic Adventure DX: Director's Cut is released in Germany for the PC.
• Feb. 6, 2004 - Sonic Heroes is released in Europe and Australia to all 128-bit era consoles, excluding the Sega Dreamcast. In addition, Sonic Adventure DX: Director's Cut is released in Europe and Australia for the PC.
• Feb. 9, 2001 - Sonic R is released in Europe for the PC under the Xplosiv budget label.
• Feb. 12, 2002 - Sonic Adventure 2: Battle is released in North America for the Nintendo GameCube.
• Feb. 13, 1997 - Sonic 3D: Flickies' Island is released in Europe for the Sega Saturn.
• Feb. 14, 1997 - Sonic & Knuckles Collection is released in Japan for the PC.
• Feb. 19, 2015 - The Sonic the Hedgehog amiibo is released in Japan.
• Feb. 20, 2007 - Sonic and the Secret Rings is released in North America for the Wii.
• Feb. 20, 2015 - The Sonic the Hedgehog amiibo is released in Europe.
• Feb. 21, 2004 - Sonic Eraser, found and extracted by PACHUKA, RyogaMasaki and Nemesis, is distributed at Sonic CulT as part of its "Green Egg Database" launch.
• Feb. 21, 2006 - Sonic Riders is released in North America to all 128-bit era consoles, excluding the Sega Dreamcast.
• Feb. 22, 2002 - The Microsoft Xbox is released in Japan.
• Feb. 22, 2008 - Sonic Riders: Zero Gravity is released in Europe for the Sony PlayStation 2 and the Nintendo Wii.
• Feb. 23, 2006 - Sonic Riders is released in Japan to all 128-bit era consoles, excluding the Sega Dreamcast.
• Feb. 23, 2008 - drx releases over 1,000 protos simultaneously, among them is over 90 Sonic-related prototypes.
• Feb. 23, 2010 - Sonic & Sega All-Stars Racing is released in North America for the Wii, Nintendo DS, Xbox 360 and PlayStation 3.
• Feb. 24, 1994 - Sonic the Hedgehog 3 is released in Europe for the Sega Mega Drive.
• Feb. 25, 2015 - Sonic Runners is released in Japan and Canada for iOS and Android.
• Feb. 27, 2004 - Sonic Battle is released in Europe for the Game Boy Advance.

March

• March 1, 2009 - Sonic and the Black Knight is released in North America for the Wii.
• March 2, 2007 - Sonic and the Secret Rings is released in Europe for the Wii.
• March 3, 2004 - Complete Trinity Sonic Heroes - Original Soundtrax, the original soundtrack of Sonic Heroes, is released in Japan.
• March 3, 2017 - The Nintendo Switch is released worldwide.
• March 4, 2000 - The Sony PlayStation 2 is released in Japan.
• March 7, 2002 - Sonic Advance is released in Germany for the Game Boy Advance.
• March 7, 2003 - Sonic Mega Collection is released in Europe for the Nintendo GameCube.
• March 8, 2002 - Sonic Advance is released in Europe and Australia.
• March 8, 2005 - Sonic the Hedgehog is inducted into the Walk of Game.
• March 9, 2001 - Sonic Shuffle is released in Europe for the Sega Dreamcast.
• March 9, 2007 - Sonic Mega Collection Plus is released in North America for the PC.
• March 10, 2005 - Sonic Mega Collection Plus is released in Poland for the PlayStation 2 and Microsoft Xbox.
• March 11, 2005 - The Nintendo DS is released in Europe.
• March 12, 2003 - Sonic Advance 2 is released in North America for the Game Boy Advance.
• March 12, 2009 - Sonic and the Black Knight is released in Japan for the Wii.
• March 13, 2009 - Sonic and the Black Knight is released in Europe for the Wii.
• March 14, 1993 - Sega sponsors Formula 1's Williams team for the 1993 season. Sonic's gloves and trademark red sneakers are painted on the car, positioned to suggest that Sonic's feet are at the pedals.
• March 14, 2002 - The Microsoft Xbox is released in Europe.
• March 14, 2003 - Sonic Mega Collection is released in Germany, Scandinavia and Australia for the Nintendo GameCube.
• March 15, 2007 - Sonic and the Secret Rings is released in Japan for the Wii.
• March 17, 1995 - Sonic Drift 2 is released in Japan for the Sega Game Gear.
• March 17, 2006 - Sonic Riders is released in Europe to all 128-bit era consoles, excluding the Sega Dreamcast.
• March 18, 1994 - Sonic Drift is released in Japan for the Sega Game Gear.
• March 18, 2003 - Sonic Advance 2 is released in Europe for the Game Boy Advance.
• March 20, 1997 - Sonic & Knuckles Collection is released in North America and Europe for the PC.
• March 21, 2001 - The Game Boy Advance is released in Japan.
• March 23, 2007 - The Sony PlayStation 3 is released in Europe.
• March 27, 1992 - Art Alive is released in North America for the Sega Mega Drive.
• March 28, 2003 - Sonic Advance 2 is released in Australia for the Game Boy Advance.
• March 31, 2006 - Sonic Mega Collection Plus is released in Europe for the PC.
• March 31, 2009 - Sonic and the Black Knight is released in Australia for the Wii.

April

• April 6, 2003 - The animated series Sonic X begins its run on Japanese television.
• April 8, 2004 - Sonic Adventure DX: Director's Cut is released in Poland for the PC.
• April 19, 1993 - The Sega CD is released in Australia
• April 21, 1995 - Knuckles' Chaotix is released in Japan for the Sega 32X.
• April 28, 1995 - Tails' Skypatrol is released in Japan for the Sega Game Gear.

May

• May 3, 2002 - Sonic Adventure 2: Battle is released in Europe for the Nintendo GameCube.
• May 10, 1992 - Sonic CD 510 Pre-release milestone.
• May 27, 1994 - Sonic the Hedgehog 3 is released in Japan for the Sega Mega Drive.
• May 28, 2003 - "Issai Gassai, YES Sonic!" - Sonic X's opening theme, "Sonic Drive", hits shelves in Japan from Hironobu Kageyama and Hideaki Takatori.
• May 29, 1993 - Fleetway begin publishing Sonic the Comic in the UK.

June

• June 7, 2004 - Sonic Advance 3 is released in North America for the Game Boy Advance.
• June 11, 2001 - The Game Boy Advance is released in the United States.
• June 15, 2003 - Sonic Pinball Party is released in North America for the Game Boy Advance and sold exclusively at Target stores.
• June 17, 2003 - Sonic Adventure DX: Director's Cut is released in North America for the Nintendo GameCube.
• June 17, 2004 - Sonic Advance 3 is released in Japan for the Game Boy Advance.
• June 18, 2004 - Sonic Advance 3 is released in Europe for the Game Boy Advance.
• June 19, 2003 - Sonic Adventure DX: Director's Cut is released in Japan for the Nintendo GameCube.
• June 20, 1997 - Sonic Jam is released in Japan for the Sega Saturn.
• June 20, 2003 - Sonic Adventure DX: Director's Cut is released in Australia for the Nintendo GameCube.
• June 22, 2001 - The Game Boy Advance is released in Europe.
• June 23, 1991 - Sonic the Hedgehog is released in North America for the Sega Mega Drive.
• June 23, 2001 - Sonic Adventure 2 is released in Japan and Europe for the Sega Dreamcast, 10 years after the release of the original Sonic the Hedgehog.
• June 24, 2001 - Sonic Adventure 2 is released in North America for the Sega Dreamcast.
• June 26, 2003 - Sonic Adventure DX: Director's Cut is released in Germany for the Nintendo GameCube.
• June 27, 2003 - Sonic Adventure DX: Director's Cut is released in Europe for the Nintendo GameCube.
• June 29, 1993 - SegaSonic the Hedgehog is released in Japanese arcades.

July

• July 1, 2004 - After over four years as a semi-autonomous subsidiary, Sonic Team is merged back into Sega Corporation, along with the remaining software divisions.
• July 13, 1969 - Kenichi Tokoi, musician for Sonic Team, is born in Tochigi Prefecture.
• July 15, 1999 - Sonic Adventure: Limited Edition, an incomplete version of Sonic Adventure, is made available for rent along with a Sega Dreamcast at Hollywood Video, an American video store chain.
• July 17, 2003 - Sonic Pinball Party is released in Japan for the Game Boy Advance.
• July 26, 1991 - Sonic the Hedgehog is released in Japan for the Sega Mega Drive with several improvements such as level order and parallax scrolling.
• July 26, 1994 - Dr. Robotnik's Mean Bean Machine (8-bit) is converted for the Sega Master System and released in Europe.

August

• Aug. 2, 1970 - Jun Senoue, musician for Sonic Team, is born in Matsushima, Japan.
• Aug. 6, 2009 - Sonic Chronicles: The Dark Brotherhood is released in Japan for the Nintendo DS.
• Aug. 9, 1996 - Sonic CD is ported to the PC and released in Japan.
• Aug. 11, 2005 - Sonic Gems Collection is released in Japan for the Nintendo GameCube and PlayStation 2.
• Aug. 15, 2017 - Sonic Mania is released in North America and Europe for the PlayStation 4, Xbox One and Nintendo Switch.
• Aug. 16, 2005 - Sonic Gems Collection is released in North America for the Nintendo GameCube.
• Aug. 18, 2004 - Sonic CulT founder PACHUKA abandons his site to Sazpaimon.
• Aug. 20, 1996 - Sega Tunes: Virtual Sonic is released in the United States.
• Aug. 22, 1997 - Sonic Jam is released in North America for the Sega Saturn.
• Aug. 22, 1998 - Yuji Naka and the Sonic Team unveil Sonic Adventure on the Sega Dreamcast in a press conference as the first true 3D Sonic game ever.
• Aug. 26, 1996 - Sonic CD is ported to the PC and released in North America.
• Aug. 26, 2004 - Sonic Team Unplugged Live 2004, a music CD containing arranged songs from various Sonic Team games, is released in Japan.
• Aug. 29, 2017 - Sonic Mania is released in North America and Europe for the PC.
• Aug. 30, 1999 - Sonic Underground begins its syndicated run in North America.

September

• Sept. 7, 1999 - Sonic the Hedgehog: The Movie, a Sonic anime dub, is available on VHS and DVD in the USA, and also becomes available in Europe shortly before the release of the Sega Dreamcast.
• Sept. 9, 1999 - (9/9/99) the Sega Dreamcast launches in North America. Sonic Adventure is one of its release titles.
• Sept. 13, 1993 - Adventures of Sonic the Hedgehog begins its syndicated run in North America.
• Sept. 14, 2001 - The Nintendo GameCube is released in Japan.
• Sept. 17, 1965 - Yuji Naka, head of Sonic Team, is born.
• Sept. 17, 2004 - Sonic Mega Collection launches as a Player's Choice release in France for the Nintendo GameCube.
• Sept. 18, 1993 - Sonic the Hedgehog, referred to by fans as "SatAM," begins its run on ABC Saturday mornings.
• Sept. 18, 2007 - Sonic Rush Adventure is released in North America and Europe for the Nintendo DS.
• Sept. 20, 1993 - Sonic CD 920 Prelease Milestone made days before relase in Japan.
• Sept. 22, 1995 - Tails Adventures is released in Japan for the Sega Game Gear.
• Sept. 23, 1993 - Sonic CD is released in Japan for the Sega CD.
• Sept. 25, 1997 - Sonic 3D: Flickies' Island is released in North America for the PC as Sonic 3D Blast.
• Sept. 25, 2008 - Sonic Chronicles: The Dark Brotherhood is released in Australia for the Nintendo DS.
• Sept. 26, 2008 - Sonic Chronicles: The Dark Brotherhood is released in Europe for the Nintendo DS.
• Sept. 27, 2016 - Sonic Boom: Fire & Ice was released in North America for the Nintendo 3DS.
• Sept. 30, 1997 - Sonic 3D: Flickies' Island is released in Europe for the PC.
• Sept. 30, 2005 - Sonic Gems Collection is released in Europe for the Nintendo GameCube and PlayStation 2.
• Sept. 30, 2008 - Sonic Chronicles: The Dark Brotherhood is released in North America for the Nintendo DS.
• Sept. 30, 2016 - Sonic Boom: Fire & Ice was released in Europe for the Nintendo 3DS.

October

• Oct. 1, 2016 - Sonic Boom: Fire & Ice was released in Japan for the Nintendo 3DS.
• Oct. 3, 1996 - Sonic CD is ported to the PC and released in Europe.
• Oct. 4, 1994 - Tails and the Music Maker is released in North America for the Sega Pico.
• Oct. 6, 1990 - The Sega Game Gear is released in Japan.
• Oct. 7, 2003 - Sonic N is released in North America for the N-Gage.
• Oct. 10, 2007 - Sonic the Hedgehog is officially announced to appear as a guest fighter in Super Smash Bros. Brawl.
• Oct. 14, 1999 - Sonic 3D: Flickies' Island is released in Japan for the Sega Saturn. In addition, the Sega Dreamcast is released in Europe.
• Oct. 15, 1994 - Sonic the Hedgehog Triple Trouble is released in North America for the Sega Game Gear.
• Oct. 16, 1992 - Sonic the Hedgehog 2 (8-bit) is released in Europe for the Sega Master System.
• Oct. 18, 1994 - Sonic & Knuckles is released in North America and Europe for the Sega Mega Drive.
• Oct. 18, 1999 - Sonic Adventure is released in Belgium, the Netherlands, and Luxembourg for the Sega Dreamcast.
• Oct. 18, 2013 - Sonic Lost World is released in Europe for the Wii U and Nintendo 3DS.
• Oct. 19, 1994 - Sonic & Knuckles / Sonic the Hedgehog 3 soundtrack is released in Japan.
• Oct. 19, 2007 - Sonic the Hedgehog (2006) is released in Europe for the PlayStation 3.
• Oct. 19, 2013 - Sonic Lost World is released in Australia for the Wii U and Nintendo 3DS.
• Oct. 20, 1985 - The Sega Master System is released in Japan as the Sega Mark-III.
• Oct. 22, 2004 - Sega Superstars is released in Europe for the PlayStation 2.
• Oct. 24, 2000 - Dreadknux launches his site The Sonic Stadium.
• Oct. 24, 2013 - Sonic Lost World is released in Japan for the Wii U and Nintendo 3DS.
• Oct. 25, 1991 - Sonic the Hedgehog (8-bit) is released in North America, Europe and Brazil for the Sega Master System.
• Oct. 25, 1992 - Sonic the Hedgehog 2 (8-bit) is released in Brazil for the Sega Master System.
• Oct. 25, 1993 - Sonic Chaos is released in Europe and Brazil for the Sega Master System.
• Oct. 26, 2000 - The PlayStation 2 is released in North America.
• Oct. 27, 1962 - Jun'ichi Kanemaru, Japanese voice actor for Sonic the Hedgehog since Sonic Adventure, is born in Koufu, Yamanashi, Japan.
• Oct. 29, 1992 - Sonic the Hedgehog 2 (8-bit) is released in Europe for the Sega Game Gear.
• Oct. 29, 2013 - Sonic Lost World is released in North America for the Wii U and Nintendo 3DS.
• Oct. 31, 2003 - Sonic Pinball Party is released in Europe for the Game Boy Advance.

November

• Nov. 1, 1975 - Sammy Corporation is founded in Japan, which would become Sega Sammy Holdings Inc. in 2004.
• Nov. 1, 2011 - Sonic Generations is released in North America and Korea for the Xbox 360 and PlayStation 3.
• Nov. 2, 2004 - Sonic Mega Collection Plus is released in North America for the PlayStation 2 and Microsoft Xbox. In addition, Sega Superstars is released there for the PlayStation 2.
• Nov. 2, 2012 - Sonic and Dr. Eggman appear in Wreck-It Ralph, which premieres in theaters in the United States.
• Nov. 2, 2015 - Sonic Lost World is released in North America and Europe for the PC.
• Nov. 4, 2010 - Sonic Free Riders is released in North America for the Xbox 360.
• Nov. 4, 2011 - Sonic Generations is released in Europe for the Xbox 360 and PlayStation 3.
• Nov. 6, 1998 - Sonic Team PowerPlay, a CD with various Sonic Team game tunes, is released in Japan. A hidden track on the CD was "Open Your Heart", the theme for the upcoming game Sonic Adventure.
• Nov. 6, 2007 - Mario & Sonic at the Olympic Games is released in North America for the Wii.
• Nov. 7, 1990 - Sonic the Hedgehog is revealed for the first time by being painted on the side of DREAMS COME TRUE's tour bus.
• Nov. 7, 2006 - drx releases an early prototype of Sonic the Hedgehog 2 for the Sega Mega Drive. This prototype was notable for its use on the TV game show Nick Arcade.
• Nov. 8, 2013 - Mario & Sonic at the Sochi 2014 Olympic Winter Games is released in Europe for the Wii U.
• Nov. 7, 2017 - Sonic Forces is released in North America and Europe for the PlayStation 4, Xbox One and Nintendo Switch and PC.
• Nov. 9, 2017 - Sonic Forces is released in Japan for the PlayStation 4, Xbox One and Nintendo Switch and PC.
• Nov. 10, 2002 - Sonic Mega Collection is released in North America for the Nintendo GameCube.
• Nov. 11, 1994 - Sonic the Hedgehog Triple Trouble is released in Japan for the Sega Game Gear as Sonic & Tails 2.
• Nov. 11, 2004 - Sega Superstars is released in Japan for the PlayStation 2.
• Nov. 11, 2006 - The PlayStation 3 is released in Japan.
• Nov. 11, 2010 - Sonic Colours is released in Australia for the Wii and Nintendo DS.
• Nov. 11, 2014 - Sonic Boom: Rise of Lyric is released in North America for the Wii U. In addition, Sonic Boom: Shattered Crystal is released in North America for the Nintendo 3DS.
• Nov. 12, 2010 - Sonic Colours is released in Europe for the Wii and Nintendo DS.
• Nov. 13, 2007 - Sonic Rivals 2 is released in North America for the PlayStation Portable.
• Nov. 14, 2000 - Sonic Shuffle is released in North America for the Sega Dreamcast.
• Nov. 14, 2006 - Sonic the Hedgehog (2006) is released in North America for the Xbox 360.
• Nov. 15, 2001 - The Microsoft Xbox is released in North America.
• Nov. 15, 2005 - Shadow the Hedgehog is released in North America and Japan for the Nintendo GameCube, PlayStation 2 and Microsoft Xbox. In addition, Sonic Rush is released in North America for the Nintendo DS.
• Nov. 16, 2010 - Sonic Colours is released in North America for the Wii and Nintendo DS.
• Nov. 16, 2012 - Sonic & All-Stars Racing Transformed is released in Europe for the Xbox 360 and PlayStation 3.
• Nov. 17, 1992 - Sonic the Hedgehog 2 (8-bit) is released in North America for the Sega Game Gear.
• Nov. 17, 1995 - Sonic Labyrinth is released in Japan for the Sega Game Gear.
• Nov. 17, 2004 - Sonic Heroes is released in North America for the PC.
• Nov. 17, 2006 - The PlayStation 3 is released in North America.
• Nov. 18, 1997 - Sonic R is released in North America for the Sega Saturn.
• Nov. 18, 2001 - The Nintendo GameCube is released in North America.
• Nov. 18, 2005 - Shadow the Hedgehog is released in Europe for the Nintendo GameCube, PlayStation 2 and Microsoft Xbox. In addition, Sonic Rush is released in Europe for the Nintendo DS.
• Nov. 18, 2008 - Sonic Unleashed is released in North America for the PlayStation 2 and Nintendo Wii.
• Nov. 18, 2010 - Sonic Colours is released in Japan for the Wii and Nintendo DS.
• Nov. 18, 2016 - The Sonic the Hedgehog level pack is released for Lego Dimensions.
• Nov. 19, 1993 - Sonic Chaos is released in Japan for the Sega Game Gear as Sonic & Tails.
• Nov. 19, 2006 - The Nintendo Wii is released in North America.
• Nov. 20, 2008 - Sonic Unleashed is released in North America for the Microsoft Xbox 360.
• Nov. 21, 1992 - Sonic the Hedgehog 2 is released in Japan for the Sega Mega Drive and Sega Game Gear.
• Nov. 21, 2004 - The Nintendo DS is released in North America.
• Nov. 22, 1994 - The Sega Saturn is released in Japan.
• Nov. 22, 2005 - The Microsoft Xbox 360 is released in North America.
• Nov. 22, 2011 - Sonic Generations is released in North America for the Nintendo 3DS.
• Nov. 23, 1993 - Sonic CD is released in North America for the Sega CD, along with Sonic Spinball for the Sega Mega Drive and Sonic Chaos for the Sega Game Gear.
• Nov. 23, 2005 - Sonic Rush is released in Japan for the Nintendo DS.
• Nov. 24, 1992 - "Sonic 2sday" occurs with the worldwide launch of Sonic the Hedgehog 2 (16-bit).
• Nov. 24, 1996 - Sonic Christmas Blast, a special Christmas Sonic animation, airs on USA Network Television.
• Nov. 24, 2005 - Sonic Gems Collection is released in Korea for the PlayStation 2.
• Nov. 24, 2006 - Sonic the Hedgehog (2006) is released in Europe for the Xbox 360.
• Nov. 25, 1993 - The Sonic Hot Air Balloon appears in the Macy's Thanksgiving Day Parade in America. The float holds more air then the others and is the first float ever created based on a video game character. The float crashed into a lamppost and injured 2 people.
• Nov. 25, 2004 - Sonic Town Amusement Park, built like a town themed after Sonic and friends, opens in Japan.
• Nov. 25, 2011 - Sonic Generations is released in Europe for the Nintendo 3DS.
• Nov. 27, 1998 - The Sega Dreamcast is released in Japan.
• Nov. 28, 2008 - Sonic Unleashed is released in Europe for the Xbox 360, PlayStation 2 and Nintendo Wii.
• Nov. 30, 1996 - Sonic 3D: Flickies' Island is released in North America for the Sega Saturn as Sonic 3D Blast.
• Nov. 30, 1999 - The Sega Dreamcast is released in Australia and New Zealand. In addition, Sonic the Hedgehog Pocket Adventure is released in North America for the Neo Geo Pocket Color.

December

• Dec. 1, 1991 - The Sega CD is released in Japan.
• Dec. 1, 2011 - Sonic Generations is released in Japan for the Xbox 360 and PlayStation 3.
• Dec. 2, 1998 – Songs With Attitude, a mini-album of the themes in Sonic Adventure, is released in Japan.
• Dec. 2, 2004 - The Nintendo DS is released in Japan.
• Dec. 2, 2005 - The Microsoft Xbox 360 is released in Europe.
• Dec. 2, 2006 - The Nintendo Wii is released in Japan.
• Dec. 3, 1999 - Sonic the Hedgehog Pocket Adventure, the first Sonic game on a non-Sega console, is released in North America for the Neo Geo Pocket Color. In addition, Sonic Adventure is released in Australia for the Sega Dreamcast.
• Dec. 4, 1997 - Sonic R is released in Japan for the Sega Saturn.
• Dec. 4, 2003 - Sonic Battle is released in Japan for the Game Boy Advance.
• Dec. 5, 1994 - Tails and the Music Maker is released in Europe for the Sega Pico.
• Dec. 7, 1994 - Sonic the Hedgehog: REMIX, with remixes of original songs from the Japanese version of Sonic CD, is released in Japan.
• Dec. 7, 1996 - Sonic the Fighters Soundtrack is released in Japan, which contains the original soundtrack.
• Dec. 8, 2006 - The Nintendo Wii is released in Europe.
• Dec. 9, 2004 - Sonic Mega Collection Plus is released in Japan for the PlayStation 2 and Microsoft Xbox. In addition, Sonic Heroes is released there for the PC.
• Dec. 9, 2008 - Sonic Unleashed is released in North America for the PlayStation 3
• Dec. 10, 1993 - Sonic Spinball is released in Japan for the Sega Mega Drive.
• Dec. 10, 2005 - The Microsoft Xbox 360 is released in Japan.
• Dec. 11, 1997 - Sonic R is released in Europe for the Sega Saturn.
• Dec. 13, 1996 - Sonic Blast is released in Japan for the Sega Game Gear as G Sonic.
• Dec. 15, 2005 - Shadow the Hedgehog is released in Japan for the Nintendo GameCube, PlayStation 2 and Microsoft Xbox.
• Dec. 16, 1998 - Sonic Adventure Remix, featuring character theme remixes, is released in Japan.
• Dec. 16, 2004 - Sonic Heroes is released in Germany for the PC.
• Dec. 17, 1995 - Sonic the Hedgehog makes a cameo appearance in an episode of The Simpsons.
• Dec. 18, 2003 - Sonic Adventure DX: Director's Cut is released in Japan for the PC.
• Dec. 18, 2008 - Sonic Unleashed is released in Japan for the Nintendo Wii.
• Dec. 19, 2002 - Sonic Mega Collection is released in Japan for the Nintendo GameCube. In addition, Sonic Advance 2 is released in Japan for the Game Boy Advance.
• Dec. 19, 2008 - Sonic Unleashed is released in Europe for the PlayStation 3.
• Dec. 20, 2001 - Sonic Adventure 2: Battle is released in Japan for the Nintendo GameCube In addition, Sonic Advance is released in Japan for the Game Boy Advance.
• Dec. 21, 2000 - Sonic Shuffle is released in Japan for the Sega Dreamcast.
• Oct. 21, 2006 - Sonic the Hedgehog (2006) is released in Japan for the Xbox 360 and PlayStation 3.
• Dec. 22, 1999 - Sonic the Hedgehog makes an appearance on the Rosie O'Donnell Show, giving out Sega Dreamcasts to the audience.
• Dec. 23, 1998 - Sonic Adventure is released in Japan for the Sega Dreamcast.
• Dec. 28, 1991 - Sonic the Hedgehog (8-bit) is released in Japan for the Sega Game Gear.
• Dec. 28, 2001 - Korokoro Comics begins publishing the second official Sonic manga in Japan, featuring art by Harukaze Santa. Korokoro specializes in comics for the prepubescent crowd.
• Dec. 30, 2003 - Sonic Heroes is released in Japan for 128-bit era consoles, excluding the Sega Dreamcast.