Sonic & SEGA All-Star Racing is a kart racing game released across several platforms. As the name suggests, several Sonic characters feature, alongside other characters from various SEGA franchises.
The game plays as a typical kart racing game with players competing in races whilst collecting power-ups and weapons along the way. The tracks are themed on various SEGA games such as Sonic the Hedgehog, Jet Set Radio and The House of the Dead. The background music is also in-game music from various SEGA games. As the player races they earn "SEGA Miles" which can be used in-game to purchase new characters, tracks and background music.
- Sonic the Hedgehog - Sonic series
- Miles "Tails" Prower - Sonic series
- Doctor Eggman - Sonic series
- Amy Rose - Sonic series
- Shadow the Hedgehog - Sonic series
- AiAi - Super Monkey Ball
- Amigo - Samba de Amigo
- Billy Hatcher - Billy Hatcher and the Giant Egg
- Knuckles the Echidna - Sonic series
- Big the Cat - Sonic series
- Beat - Jet Set Radio
- Ulala - Space Channel 5
- B.D. Joe - Crazy Taxi
- Zobio and Zobiko - The House of the Dead: EX
- Ryo Hazuki - Shenmue
- Jacky Bryant and Akira Yuki - Virtua Fighter
- Mobo and Robo - Bonanza Bros.
- Chuih, ChuBei, ChuPea and ChuBach - ChuChu Rocket!
- Opa-Opa - Fantasy Zone
- Alex Kidd - Alex Kidd in Miracle World
- Banjo and Kazooie - Banjo-Kazooie (Xbox 360 version only)
- Xbox 360 Avatar - (Xbox 360 version only)
- Mii - (Nintendo Wii version only)
 Bonus & DLC characters
- Ryo Hazuki with Forklift - Originally a pre-order bonus in Europe, it later became available to download from April 1st 2010
- Metal Sonic - Available to download from April 8th 2010 (360) and April 22nd 2010 (PS3). Also included in the download pack was a new Death Egg themed track.
 Proposed Characters
Other characters that were known to be considered for the roster but didn't make it into the full game are:
- Toejam and Earl - From the game series of the same name, SEGA and Toejam and Earl Productions could not come to an agreement over terms.
- Gillius Thunderhead - From Golden Axe. He was originally seen riding a Chicken Leg in prototypes for the game but didn't make the final cut.
- Segata Sanshiro - From the Japanese series of Saturn adverts, he was said to be riding a giant Sega Saturn but didn't make the final cut.
- Mario - From the Mario series of games, he is said to have been excluded to prevent confusion between the SEGA All-Stars series of games and the Mario & Sonic series of games.
Also worthy of note was that NiGHTS from the NiGHTS into Dreams series of games was included as the games flagman after a fan campaign to the games developers to have a NiGHTS character included.
- Whale Lagoon - Seaside Hill - Sonic the Hedgehog series
- Lost Palace - Seaside Hill - Sonic the Hedgehog series
- Ocean Ruin - Seaside Hill - Sonic the Hedgehog series
- Roulette Road - Casino Park - Sonic the Hedgehog series
- Pinball Highway - Casino Park - Sonic the Hedgehog series
- Bingo Party - Casino Park - Sonic the Hedgehog series
- Turbine Loop - Final Fortress - Sonic the Hedgehog series
- Dark Arsenal - Final Fortress - Sonic the Hedgehog series
- Thunder Deck - Final Fortress - Sonic the Hedgehog series
- Egg Hangar - Death Egg Zone - Sonic the Hedgehog series (DLC track)
- Icicle Valley - Blizzard Castle - Billy Hatcher series
- Rampart Road - Blizzard Castle - Billy Hatcher series
- Lava Lair - Dino Mountain - Billy Hatcher series
- Treetops - Jumble Jungle - Super Monkey Ball
- Sandy Drifts - Detritus Desert - Super Monkey Ball
- Monkey Target - Pirates Ocean - Super Monkey Ball
- Shibuya Downtown - Tokyo-to - Jet Set Radio
- Rokkaku Hill - Tokyo-to - Jet Set Radio
- Highway Zero - Tokyo-to - Jet Set Radio
- Sunshine Tour - Carnivaland - Samba de Amigo (Not in the DS version)
- Jump Paradise - Carnivaland - Samba de Amigo
- Rocky-Coaster - Carnivaland - Samba de Amigo (Not in the DS version)
- Studio Amigo - Carnivaland - Samba de Amigo (DS version only)
- Sun Fair - Carnivaland - Samba de Amigo (DS version only)
- Outer Forest - Curien Mansion - The House of the Dead
- Sewer Scrapes - Curien Mansion - The House of the Dead
- Deadly Route - Curien Mansion - The House of the Dead