Fast Game Finish
Start a classic and story at any difficulty. At the cheats enter urown3d. Go on the story or classic and change level. You should have got the last level. Finish it to beat the game fast.
Get A Bunch Of Bikers
Go to options and type in "JARMIE" as a code and
you will get all major bikers, like Dave Mirra,
TJ lavin, Matt Hoffman, and Rick Thorne
(NOTE: You wont have bikes but they will be able
to skateboard with them)
Unlock All Levels
Go to gameoptions select cheatcodes and type in
urown3d, and hit done you've just unlocked every
level in the game.
Go to options. Then go to cheats. Then type
in "straightedge" and hit done.
Go to Cheat codes on Underground 2, then
type "boxoffice". Click done.
Get Natas Koupas
Go to game options. Go to cheat codes.
Enter "bedizzy" as a cheatcode. Go to free skate
and select him to see if it worked.
Enter "likepaulie" as a cheat code.