Pause the game, hold L then press Start, A, White, Up, Right, Down, A, Y, B, A, B, Y.
Clear Career Mode:
Pause the game, hold L then press Down, Up, Left, Left, B, A, B, Y.
Unlock Treyarch Decks:
Pause the game, hold L then press White, B, Up, A, Right, Down, Start.
Turn blood off and on:
Pause the game, hold L then press Start, Black, A, B, Start.
Bonus cut level:
Pause the game, hold L and press Up, Down, Up, Left, Up, Right, Left, Down, Up, Right, Left, Right, Right, Right, Up, Down, X, Y, Up, Left.
In San Fransico there is a place where you can do unlimited tricks. First go all the way do the hill towards the brown ramp, get on the very top of that wall. You can get there by grinding it or being lucky and landed on it. This place gave me -19954275993 points just by doing a simple judo + crossbone. To get off first it will take you into a "W" motin after you have moved in the "W" motin it will take you slowly towards the end of it. Make sure you make it though. Enjoy. Ps if you dont get up there the first time just keep trying. It would be helpful if you have the moon phycsis on.
(supplied by: davd10)