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I also got JET ranking on most of the Jet Graffiti Time trials but I've not opened up any new characters yet?
But anyway, cool game.
With the scoring you just have to go around the level and find a 500x rail and not the 10x. Also if you use Y to do grind combos the score will go up to a multiple of 16 while using X only goes up to 8. You really need to use Y to get some of the higher scores needed.