At the Cheat code menu in options, enter the following:
Perfect rail balance:
tightrope
Unlock THPS1 Tony Hawk:
birdman
Unlock most features:
monkey c monkey do
Decreased gravity:
i can fly
The following skaters and levels will become unlocked after you perform the listed task:
Alien Doctor:
Beat Normal Story Mode
Australian Cop:
Beat Every Classic Mode Goal on Sick Difficulty
Boat Captain
Beat Normal Story Mode
Bratwurst Vendor:
Beat Every Classic Mode Goal on Sick Difficulty
Canada-THPS 3 Level:
Beat Normal Story Mode
Corn Vendor:
Beat Every Classic Mode Goal on Sick Difficulty
German Cop:
Beat Every Classic Mode Goal on Sick Difficulty
German Drunk 3:
Beat Every Classic Mode Goal on Sick Difficulty
Horn Player:
Beat Every Classic Mode Goal on Sick Difficulty
Lost Soul 1:
Beat Normal Story Mode
Lost Soul 2:
Beat Every Classic Mode Goal on Sick Difficulty
Metal Detector Guy:
Beat Every Classic Mode Goal on Sick Difficulty
Neversoft Video:
Beat Every Classic Mode Goal on Any Difficulty
Paulie Ryan:
Beat Normal Story Mode
Pirate:
Beat Every Classic Mode Goal on Sick Difficulty
School-THPS 1 Level:
Beat Normal Story Mode
Shrek:
Beat Easy Story Mode
Skatopia Punk:
Beat Every Classic Mode Goal on Sick Difficulty
Space Monkey:
Beat Easy Story Mode
The Hand:
Beat Normal Story Mode
Zombie 2:
Beat Every Classic Mode Goal on Sick Difficulty
Complete All Gaps in order to unlock the following:
All of the food venders
All of the musicians
Always Special
Bigfoot One (cartoony version)
Boxer
Inline Skater
Lost Soul 3
lounge singer(the devil)
Mayan with Tiki mask
Moon Gravity
Perfect Grind
Perfect Manual
Perfect Skitch
Skaboto(robot in front of skatopia)
Space Monkey 3
Cheat: Single Disc Mulitplayer
If you want to play against friends, but only have one disc, there’s a way you can still play using one UMD. Create a game on Ad Hoc mode and start the game on one PSP, wait for the game to load, then remove the UMD. Place the game in another PSP, load the game, and there you have an available multiplayer game!