Tony Hawk's Underground 2 Remix cheats and cheat codes for Sony PSP

Unlock Perfect Rail Balance: Enter TIGHTROPE as a code.
Unlock original Tony Hawk's: Enter BIRDMAN as a code.
Invisible skater: Enter "sellout" as a code.
Enable moon gravity: Enter "i can fly" as a code.
Most bonuses unlocked: Enter "monkey c monkey do"
or "monkeycmonkeydo" as a code.

Unlock Shrek + Space Monkey: Finish story mode in the easy setting

Unlock Doctor, Captain, Lost Soul, Paulie Ryan, The Hand +
Pro Skater School, Pro Skater 3 Canada, Pro Skater levels:
Finish story mode in normal setting

Run:
When you not skateboarding, press X to run.

Complete all gaps to unlock the following cheats:
Always Special
Moon Gravity
Perfect Grind
Perfect Manual
Perfect Skitch

Unlimited supply:
After you find Voltraman, press Square and he will throw a electric balls.
It takes awhile for them to disappear.

Make Graffiti:
While walking Press Triangle on a wall and you will make graffiti.

Run:
Hold X to run (when you are not on the skateboard).

Freak out:
When you wipeout and you can freak out press Up and Down repeatedly.