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Playstation - Grind Session cheats

All tricks available
Pause the game play, then press Down, Left, Up, Right, Down, Left, Up,
Right. 

Unlock Master Ao as playable character
Play with any character. Get all photos, coins and keys in both wings of 
the dream house to unlock him. Master Ao have full vert, street, 
balance meter, plus he has all trick.

Unlock Huntington level
Go to the big gray ramp with a blue streak on the bottom that is in front 
of a wall. Go off the ramp, and perform an air trick (e.g. Christ Air). 
Try to hit the wall in the middle of the trick, and if you 
land it perfectly you will get the maximum points.