Tony Hawk's Pro Skater 

All tapes 
Pause the game, then hold L and press C-Right, Left, Up, C-Up(2), Right, Down, Up.
If you entered the code correctly, the pause screen will shake.

Fast specials 
Pause the game, then hold L and press C-Up, Left, C-Down(2), Up, Down, Right.
If you entered the code correctly, the pause screen will shake.

Perfect balance 
Pause the game, then hold L and press C-Up, C-Right, Left, C-Right, Right, Up, Down.
If you entered the code correctly, the pause screen will shake.

Raise stats to 10 
Pause the game, then hold L and press C-Up, C-Left, Left, Up, C-Down.
 If you entered the code correctly, the pause screen will shake.

Raise stats to 13 
Pause the game, then hold L and press C-Up, C-Left, Left, Up, Down.
If you entered the code correctly, the pause screen will shake.

10x trick multiplier 
Pause the game, then hold L and press Down, Right, Up, Right, Up, Left, C-Left. 
If you entered the code correctly, the pause screen will shake.

Slow-motion mode 
Pause the game, then hold L and press Down(2), C-Up, C-Right, Left.
If you entered the code correctly, the pause screen will shake.

Turbo mode 
Pause the game, then hold L and press Right, Up, Down(2), Up, Down.
If you entered the code correctly, the pause screen will shake.

Random starting locations 
Pause the game, then hold L and press C-Left, C-Right, C-Down, Up, Down.
If you entered the code correctly, the pause screen will shake.

Girl's picture 
Pause the game, then hold L and press C-Left, C-Down, C-Right, C-Left, C-Down, C-Right(2).
If you entered the code correctly, the pause screen will shake, and a picture of a girl will appear.

Play as Officer Dick 
Collect all thirty tapes with any character in career mode to unlock Officer Dick as a playable character.

Play as Private Carrera 
Start a game in any mode with Officer Dick. Pause the game,
then hold L1 and press C-Left, C-Down, C-Right, C-Down, Up, Right, Left.
The screen will not shake. Exit the game and return to the character selection screen.
Private Carrera will appear in place of Officer Dick.
This character has full stats and great specials.

View skater's special moves 
Use any character to get the gold in all three competitions.
Then, select the "Trick Tutorial" option on the extras menu to view that skater's special moves.