Go to the options screen and go to the cheat menu:
and type in MARKEDCARDS (IN ALL CAPS)
when your done with the cheat you should here the sound of a cash register that means it worked no go to career mode, choose a level when the level starts pause the game and you should have the word cheats on the pause screen go to it and put what ever you want on.
PEACE OUT
THIS DOES NOT GIVE YOU ALL THE SECERET SKATERS...