Sim mode:
Successfully complete one Pro Challenge.

Moon physics:
Successfully complete two Pro Challenges. SloMo Tricks:
Successfully complete three Pro Challenges.

Little Person hidden skater:
Successfully complete four Pro Challenges.

Always special:
Successfully complete five Pro Challenges.

Perfect balance:
Successfully complete six Pro Challenges.

Stud mode:
Successfully complete seven Pro Challenges.

Little Big World level:
Get 100 Goal Points.

Skip introduction sequences:
Hold L1 + L2 + R1 + R2 and power on the PlayStation. Keep the buttons held to skip the Activison 02, Visions, Neversoft, and Tony Hawks Pro Skater 4 introductions and get directly to the loading screen.

Hint: Bob Burnquist: Special moves:
Perform the following moves with a full meter.

BS One Foot Smith: Press Up, Down, Triangle.
Samba Flip: Press Left, Right, Circle.
Sit Down Air: Press Left, Down, Circle.

Hint: Kareem Campbell: Special moves:
Perform the following moves with a full meter.

B-Ballin Slide: Press Left, Right, Triangle.
Double Blunt Slide: Press Down, Up, Triangle.
Kickflip Backflip: Press Left, Down, Circle.

Hint: Rune Glifberg: Special moves:
Perform the following moves with a full meter.

Backfoot Flip Nosegrab: Press Right, Up, Circle.
BS Crail Slide: Press Right, Down, Triangle.
Kickflip Kickflip: Press Left, Down, Square.

Hint: Steve Caballero: Special moves:
Perform the following moves with a full meter.

Daffy Grind: Press Up, Down, Triangle.
FS 540: Press Left, Down, Circle.
Kickflip Superman: Press Right, Up, Square.

Hint: Tony Hawk: Special moves:
Perform the following moves with a full meter.

Barrel Roll: Press Left, Down, Square.
Froggy Grind: Press Left, Down, Triangle.
The 900: Press Right, Down, Circle.

Hint: Taunt:
Stand still during game play then press one of the following to taunt.

No Way Taunt: Press L1 + R1 + Circle.
Your Daddy Taunt: Press L1 + R1 + Square.
Props Taunt: Press L1 + R1 + Triangle.
Get Some Taunt: Press L1 + R1 + X.

Glitch: Hidden music:
Pause game play (two player mode recommended). At the pause menu, play the same music track repeatedly. This will eventually result in some secret music playing. It will sound like the menu music, but have lyrics to it.