Successfully complete the game, then talk to RoBoy. Test Run mode will now be available.

Hidden characters:

• A.ku.mu.: Achieve a "Jet" ranking in Fortified Residential Zone.

• Beat: Defeat him in a street race.

• Boogie: She can be found at Kibogaoka Hill. Note: Boogie was known as Piranha in Jet Grind Radio and Sugar in Jet Set Radio.

• Clutch: Find Clutch through DJ Professor K's instructions.

• Combo: Successfully complete his challenges.

• Cube: Go to the Bottom Point of Sewage Facility and outrace Cube in the City Rush. This must be done after beating the Noise Tanks in Sky-Dinosaurian Square.

• Doom Riders: Achieve a "Jet" ranking in Dogenzaka Hill.

• Goji Rokkaku: Achieve a "Jet" ranking in Rokkaku-Dai Heights.

• Garam: Successfully complete his challenges.

• Immortals: Achieve a "Jet" ranking in Skyscraper District and Pharaoh Park.

• Jazz: Defeat Jazz at City Rush in the Future Site of Rokkaku Expo Stadium.

• Love Shockers: Achieve a "Jet" ranking in Hikage Street.

• Noise Tanks: Achieve a "Jet" ranking in Highway Zero.

• NT-3000: Achieve a "Jet" ranking in Sky-Dinosaurium Square.

• Poison Jam: Achieve a "Jet" ranking in Test Run mode at the Tokyo Underground Sewage Facility and the Bottom Point of the Sewage Facility.

• Potts: Achieve a "Jet" ranking in Kibogaoka Hill.

• Rapid 99: Achieve a "Jet" ranking in 99th Street.

• Rhyth: Go to the top of the Poison Jam warehouse in Rokkaku-dai Heights to find her the first time. Follow and find her two more times in the game. Note: Rhyth was known as Mew in Jet Grind Radio and Bis in Jet Set Radio.

• RoBoy: Achieve a "Jet" ranking in Chou Street. Note: A.ku.mu. must first be unlocked before you can unlock RoBoy.

• Soda: Defeat Soda at City Rush in Highway Zero. Note: Soda was known as Slate in Jet Grind Radio.

• Zero Beat: Achieve a "Jet" ranking in Test Run mode at Shibuya Terminal.

• Immortals: Achieve a "Jet" ranking in Skyscraper District and Pharaoh Park.