Before entering the following codes you must first on any level pause the game and hold 7 on the number pad. Then enter the code for the corresponding effect and if entered correctly the text in the Pause menu will shake as confirmation.
Unlock the following effects by completing the corresponding task without using Tony Hawk, Officer Dick, a Custom Skater and Spider-Man unless stated otherwise.
Unlock Officer Dick: Beat the game 100% one time with any character.
Unlock Skip To Restart: Choose your starting position in a level, beat the game 100% with 2 charcters.
Unlock Kid Mode: Skaters look like little kids, beat the game 100% with 3 different charcters.
Unlock Perfect Balance: Beat the game 100% with 4 different charcters.
Unlock Always Special: Full Special Meter continuously, beat the game 100% with 5 different charcters.
Unlock STUD Cheat: Full stats but doesn't display it, beat the game 100% with 6 different charcters.
Unlock Weight Cheat: Allows you to select the weight of your skater, beat the game 100% with 7 different characters.
Unlock Wirframe Mode: Reveals only the polygons of a level without colors or textures, beat the game 100% with 8 different characters
Unlock Slow-Nic: Game plays in slow motion, beat the game 100% with 9 different characters.
Unlock Big Head Cheat: Beat the game 100% with 10 different characters.
Unlock Sim Mode: Skater's abilities become more realistic, beat the game 100% with 11 different characters.
Unlock Smooth Cheat: Eliminates ALL textures, beat the game 100% with 12 different characters.
Unlock Moon Physics: Gravity becomes less, beat the game 100% with 13 different characters or beat the game 100% with Officer Dick.
Unlock Disco Mode: Objects on the level blink different colours, beat the game 100% with 14 different characters.
Unlock Private Carrera: Get every single gap in the game.
Unlock Spider-Man: To earn Spider-Man, complete the game 100% with a custom character.
Unlock original THPS Levels: To unlock three original THPS levels (Downhill Jam, Warehouse, and Skate Park) win one gold in each of the three competitions.
Unlock Secret Wind Tunnel in the Hangar: To unlock the secret wind tunnel area in the Hangar grind across the propellor that is at the back of the half pipe.
Unlock Chopper Drop: To unlock Chopper Drop, a huge halfpipe in the middle of the ocean with a pier you can jump to, get gold medals with everyone in the game including Officer Dick, a Custom Skater, and Spider-Man.
Unlock Skate Heaven: Beat the the game 100% getting every goal on every Career mode level with every skater to unlock Skate Heaven, a huge level with awesome areas.