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.
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