Jet Grind Radio Cheats
Alternate introduction sequence
Tap A over and over again after turning on the game. You will hear the trademark SEGA scream instead of a short jingle when the logo appears.
Unlock Poison Jam
Finish the Kogane-Cho levels with a JET rank.
Unlock Professor K
Finish the game and save at the end. Professor K will now be unlocked between Garam and Beat in the character selection prompt.
Unlock the Noise Tanks
Finish the Benten-Cho levels with a JET rank.
Unlock the Love Shockers
Finish the Shibuya-Cho levels with a JET rank.