Tony Hawk's Underground 2 Remix [PSP]

Original Tony Hawk's Pro Skater Tony Hawk
Enter "BIRDMAN" as a code. Choose the "Secret Characters" option at the character selection screen in classic or free skate mode to access the original Tony Hawk.

Perfect rail balance
Enter "TIGHTROPE" as a code to unlock the "Perfect Rail Balance" option at the cheat menu during a game.

Run
When you are not on the skateboard, hold down X to run.

Skip Berlin
On any difficulty, when you start the level, just go to phil any time and he will ask you if you want to go and just say, yes.

Unlimited Supply
When you find the Voltraman, press down Square and he will throw electric balls. It takes a while for them to disappear.

Completion bonuses:
Complete story mode under the easy difficulty setting to unlock Shrek and Space Monkey characters.

Successfully complete story mode under the normal difficulty setting to unlock the Alien Doctor, Boat Captain, Lost Soul 1, Paulie Ryan, and The Hand characters; and Tony Hawk's Pro Skater School, Tony Hawk's Pro Skater 3 Canada, and Pro Skater levels.

Complete all classic mode goals under the sick difficulty setting to unlock the Australian Cop, Bratwurst Vendor, Corn Vendor, German Cop, German Drunk, Horn Player, Lost Soul 2, Metal Detector Man, Pirate, Skatopia Punk, and Zombie 2 characters.

Berlin: Easy points:
Go down the stairs, then past the cop in front of the door. Then go through that door and you will be on the roof. Walk into the air conditioning unit and it will break. Then, walk over the sparks on the ground where it was. You should get 1,000 points each time. This is helpful for getting the scoring goals completed in Classic mode.

Combo and high score objectives:
For the combo and high score objectives, do a long manual. While in the manual, press Square, Triangle, or Circle to do other types of manuals to add in your combo.

Control camera:
When skating, use the Analog-stick to move the camera. Note: Moving it when you are not on the skateboard will make you walk or run.

Run:
When you are not on the skateboard, hold X to run.

Get inside corners:
Come up to a corner and do a grab or flip trick. If there is an area behind the corner, you can go through the wall. This is a good way to get inside of buildings.

Unlock Alien Doctor
Beat Normal Story Mode.

Unlock Australian Cop
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Boat Captain
Beat Normal Story Mode.

Unlock Bratwurst Vendor
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Canada THPS 3 Level
Beat Normal Story Mode.

Unlock Corn Vendor
Beat Every Classic Mode Goal on Sick difficulty.

Unlock German Cop
Beat Every Classic Mode Goal on Sick difficulty.

Unlock German Drunk 3
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Horn Player
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Lost Soul 1
Beat Normal Story Mode.

Unlock Lost Soul 2
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Metal Detector Guy
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Neversoft Video
Beat Every Classic Mode Goal on any difficulty.

Unlock Paulie Ryan
Beat Normal Story Mode.

Unlock Pirate
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Pro Skater Alien Level in Story Mode
Beat Normal Story Mode.

Unlock School THPS 1 Level
Beat Normal Story Mode.

Unlock Shrek
Beat Easy Story Mode.

Unlock Skatopia Punk
Beat Every Classic Mode Goal on Sick difficulty.

Unlock Space Monkey
Beat Easy Story Mode.

Unlock The Hand
Beat Normal Story Mode.

Unlock Zombie 2
Beat Every Classic Mode Goal on Sick difficulty.