Cheat codes:

Cheat mode:
     Pause  the  game, then hold L1 and press Circle, Right, Up, Down,
Circle, Right, Up, Square, Triangle.

Remove onscreen displays:
     Pause the game, then hold L1 and press Square, Left, Up,
Triangle.

Slow Mo:
     Pause the game, then hold L1 and press Square, Left, Up, Square,
Left.

Go To Restart Option:
     Pause the game, then hold L1 and press Square, Circle, X, Up,
Down.

Special Available Anytime:
     Pause the game, then hold L1 and press X, Triangle, Circle, Down,
Up, Right.

Get 10X Multiplier:
     Pause the game, then hold L1 and press Triangle, X, Triangle.

Get 13x multiplier:
     Pause  the  game,  then  hold  L1  and  press  X, Square, Square,
Triangle, Up, Down.

Level select:
     Pause  the  game,  then  hold  L1  and press Triangle, Right, Up,
Square, Triangle, Left, Up, Square, Triangle.

Get Big Head Mode:
     Pause the game, then hold L1 and press Square, Circle, Up, Left,
Left.

Get 1 900 000 points.:
     Pause  the  game,  then  hold  L1 and press Circle, X, X, R2, R2,
Square.  Do  that  2  two times. The screen wont shake. Go back to the
main menu and start over in single session and pick Bob. If it doesn't
work try it once more.

Neversoft Bails FMV sequence:
     Unlock  Officer Dick as a character and use him to win three gold
medals.  The Neversoft Bails FMV features the game's developers trying
to skate.

More Points:
     During flight, hold Circle and release before hitting the ground.

Half Pipe Moves:
     Tony Hawk - Press Left, Left, Square while on the halfpipe in the
street course to do a 540 Board Varial

     Bob Burnquist - Press Left, Left, Square while on the halfpipe in
the street course to do a Fingerflip Airwalk

Big Combo:
     On  demo,  when you first start, hold down x and left. Ollie into
the wall and hit X to do a wallride. Do a few tricks (3 360 flips gets
most  points)  and  hit  triangle.  Hold  X down and do shoveits (up +
square)  into  nose  grinds  (up  +  triangle) and impossibles (down +
square)  into  5-0 grinds (down + triangle.) At the end of the quarter
pipe  rail hit x and you should bounce off of the wall. After this you
can  either play it safe by doing the above tricks again until the end
of the rail, or else do a heelflip into the front cornerclosest to you
of  the  beam  and  grind  back.  At  the bottom of the screen it says
(number  times  something)  dont  let  it  go  past twenty or the game
pauses.  Be  sure  to  do  a grab off of it for variety you should get
127,000 points

Big Points:
     In  the  Pheonix  Downhill Jam level go past the dam halfpipe and
turn  around  and  go  back  up.  When your almost at the top jump and
you'll  do  a messed up levatate a few inches above the ground and you
will start going back down. While your levitating you can pull off mad
tricks  and  you  won't land so you can get aboutaround ten triks then
you want to stop so when you hit the the big rock with the hidden tape
on it so when you hit you won't fall.

Big Combo:
     Go  to  the  Warehouse  with Bob Burnquist. Do a backflip through
were  you  get  the  hidden tape. Then, land on the pole and grind it.
Then  jump  at  the end and start grinding again. Grind as much as you
can and you can get big.

Skate upside down:
     Start the San Francisco level and head towards Hubba's Hideout by
going down the big hill, then take a left. Go underneath Hubba's Ledge
straight  towards a quarter pipe against a wall, get some speed, go up
the  quarter  pipe, do a wall ride and go off of the right side. Ollie
out  of  the wall ride and try to land on a tall brownish cage colored
object. If you land on top of it and ride around on it for awhile, you
will be able to skate upside down until you try to ollie.

Do a flip:
     Use  the  Black dude. Get special mode...then whenever you go off
of  a  ramp do a fast plant off of the ramp (hold X and press Up, Up).
Once in the air push Up and hold down Circle

Do a mctwist:
     Use  Tony  Hawk (of course). Then get special mode. once you have
special  mode do an air (you do not need to do a fast plant to do this
trick)  Once in the air push to the right twice then press the Circle.
Only  prob  I  have  found  is  that  it does not seem to register any
points.

Unlock Each Skaters Videos:
     To  see a skater's end movies get the gold medal with that skater
in all 3 competitions.

Play as Officer Dick:
     Use a single character to get all thirty tapes in career mode.

Play as Private Carrera:
     Start  a  game in any mode as Officer Dick. Pause game play, then
hold  L1  and  press  Triangle,  Up,  Triangle,  Up, Circle, Up, Left,
Triangle.  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. Note:
The game will freeze if you try to restart the game as her.

Unlimited tricks:
     On the night street course, head towards the long quarter pipe in
the  middle of the stage. Try and get as close as possible to the edge
of  the lip. Before getting air off it, do a sharp right turn. If done
correctly  you  will be trapped (stuck) to the coaping. You can do any
trick  as  long  as  you want. Keep turning and twisting to score high
points.  to  then  get  off, make sure your facing the direction to go
down  the  vert, ollie a few times. You can score up to as much as 500
00 points.

Bob burnquist and Private Carrera moves:
     Press  Left,  Up,  Square  + Circle and they will do their coping
tricks in the air.

High points trick:
     Take  elisa  steamer  or  anyone  with a pretty easy backflip and
special  grind then go to burnside, pump up the special. Do a backflip
up  on the bridge the flip/grind to the end using special grind/normal
grinds then drop to the ledge/curve thing and grind again the end. Its
about  180000-190000  the  first  time.  Repeat it again and again for
2min. I got about 600000 points.

900:
     If you pick Tony Hawk and you are on special you can press Right,
Down, Circle and Tony will do the 900.

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Special moves:

Everyone has 3 special moves
All moves done on ramp or half-pipe, not kicker or walls and such. 

1) The one the little booklet tells you 

2)Secret Moves:

Geoff Rowley - Right, Down, Square
Bucky Lasek - Down, Up, Square
Chad Muska - Right, Down, Triangle
Kareem Campbell - Up , Down, Triangle 
Andrew Reynolds - Left, Left, Square
Rune Glifberg - Up, Down, Square
Jamie Thomas - Up, Up, Triangle 
Elissa Steamer - Up, Down, Circle 

3)Either McTwist, FrontFlip or Backflip:

McTwist - Left, Left, Cirle
BackFlip - Down, Up, Circle
FrontFlp - Up, Down, Circle
     (You  have  to  test  these out per character. Each character has
only 1 of the ones above)