Play as Goji Rokkaku
To play as Goji, first unlock the three previous gangs (Poison Jam, Love Shockers, and Noise Tank), then get a Jet Ranking on the Grind City stages.
Play as Love Shockers
To play as the punked out skaters, complete every Shibuya-cho stage with a Jet rating.
Play as Noise Tank
To play as the toxic gang, complete every Benten-cho stage with a Jet rating.
Play as Poison Jam
You can play as the gang members with the monster costumes by getting a Jet Ranking on ever Kogane-cho Story stage.
Skate backwards
Press up then down while skating to skate backwards.
Tag groups quicker
When spraying a member of a group, repeatedley press the spray button and you will hit them 3-4 times.
Unlock all gang members
When it says New Game, choose the t word then press X, Y, A, B, B, A, Y, X.