Big Head Mode:
Pause the game, then hold (Numpad 7) and press C, B, (Up, (Left), (Left), C, (Right), (Up), (Left). if you entered the code correctly, the pause screen will shake.
Or beat the game by completing all level objectives in career mode ten times.

Blood Mode:
Pause gameplay, hold "Numpad-7" and press: Right, Up, C, V.

Cheat Mode:
Pause the game, then hold Numpad 7 and press spacebar, spacebar, spacebar, C, V, Up, Down, Left, Up, C, V, Spacebar, V, B, Spacebar, V, B.
The pause screen will shake if you entered the code correctly. Next, select the "End Run" option from the pause menu. All cheats, FMV seqences, and skaters will be unlocked.

Fat Skater:
Pause the game, hold "Numpad-7" and press: Spacebar, Spacebar, Spacebar, Spacebar, Left, Spacebar, Spacebar, Spacebar, Spacebar, Left, Spacebar, Spacebar, Spacebar, Spacebar, Left. Keep repeating to make skater fatter.

Neversoft Skaters:
At the Main Menu, hold "Numpad-7"and press: Up, C, C, V, Right, Up, B, V. Now create a skater with a Neversoft Dev Team name.

Example: Joel Jewett (president of Neversoft)
         Connor Jewett (Joel's Son)
         Mick West
         Aaron Cammarata
         Ralph D'Amato
         Noel Hines
         Gary Jesdanun
         Ryan McMahon
         Nolan Nelson
         Johnny Ow
         Scott Pease
         Chris Rausch
         Darren Thorne
         Jason Uyeda

Raise Stats to 10:
Pause the game, hold "Numpad-7" and press: Spacebar, V, B, C, V, Up, Down.

Special Meter Always Full:
Pause the game, hold "Numpad-7" and press: Spacebar, V, B, B, Up, Left, V, C.

Thin Skater:
Pause the game, Hold "Numpad-7" and press: Spacebar, Spacebar, Spacebar, Spacebar, C, Spacebar, Spacebar, Spacebar, Spacebar, C, Spacebar, Spacebar, Spacebar, Spacebar, C. Keep repeating to make skater thinner.

Turbo Mode:
Pause the game, hold "Numpad-7" and press: Down, C, V, Right, Up, B, Down, C, V, Right, Up, B.

Special Moves:
The following moves can be performed when your character's special meter is flashing yellow.

Andrew Reynolds 
Nose-grab tailslide -- Up, Down, Grind 
Triple heel flip    -- Up, Right, Kick flip 
Hard-flip late flip -- Up, Down, Kick flip 

Bob Burnquist 
Rocket tailslide    -- Up, dDown, Grind 
One-foot smith      -- Right, Down, Grind 
Racket air          -- Left, Down, Grab 

Bucky Lasek 
The big hitter      -- Left, Down, Grind 
One-foot Japan      -- Up, Right, Grab 
Finger-flip airwalk -- Left, Right, Grab 

Chad Muska 
Mute back flip     -- Up, Down, Grab 
Hurricane          -- Down, Right, Grind 
Muska nose man     -- Right, Up, Grab 

Elissa Steamer 
Madonna tailslide  -- Up, Left, Grind 
Hospital flip      -- Left, Right, Kick flip 
Indy back flip     -- Up, Down, Grab 

Erik Koston 
The fandangle      -- Right, Down, Grind 
Indy front flip    -- Down, Up, Grab 
Pizza guy          -- Down, Left, Grab 

Geoff Rowley 
Rowley darkslide   -- Left, Right, Grind 
Double hard flip   -- Right, Down, Kick flip 
Half-flip casper   -- Right, Left, Kick flip 

Jamie Thomas 
Beni F-flip crooks -- Down, Up, Grind 
Laser flip         -- Down, Right, Kick flip 
One-foot nose manual -- Left, Up, Grab 

Kareem Campbell 
Ghetto bird        -- Down, Up, Kick flip 
Nosegrind to pivot -- Down, Up, Grind 
Casper             -- Left, Down, Grab 

Rodney Mullen 
Nollie flip under flip -- Down, Left, Kick flip 
Casper to 360 flip     -- Down, Right, Grab 
Heel-flip darkslide    -- Right, Left, Grind 

Rune Glifberg 
One-foot bluntslide    -- Left, Up, Grind 
Kick-flip one-foot tailslide -- Left, Down, Kick flip 
Christ air             -- Left, Right, Grab 

Steve Caballero 
Hang ten               -- Right, Up, Grind 
Triple kick flip       -- Up, Left, Kick flip 
FS 540                 -- Right, Left, Grab 

Tony Hawk 
Overturn               -- Down, Left, Grind 
Sacktap                -- Up, Down, Grab 
The 900                -- Get a lot of air and press right, down, grab 

All Levels Characters and Cheat Codes:
Pause the game on any level at on the career mode, then press and hold numpad7 and press Space, Space, Space, C, V, Up, Down, Left, Up, C, V, Space, V, B, Space, V, B. then relase numpad 7 and choose End Run!

Jetpack Mode:
Pause during the game and hold Number Pad key 7 and press Up, Up, Up, Up, C, Spacebar, V, Up ,Up ,Up ,Up ,C ,V ,Up ,Up ,Up ,Up. The screen will shake and Unpause and fly with ollie in mid-air to float. Use like the Playstation version.

 

Thanks to Revolution reader Ronald Muis (the mouse man), Computer Wizard, maria sheculski and Niko Hämäläinen !