Game: Tony Hawk's Underground
Platform:
Cheats & Hints:
Cheat: Unlock All Movies:
Enter digivid in the Cheats Menu.
Moon Gravity Code:
Select "Cheat Codes" at the options menu, then enter "noforce" as a code. (An alternate code is "getitup".) You can also get this code if you complete all 129 goals.
Perfect Balance:
Go to the options menu, then go to cheats, and type in "letitslide".
Perfect Manual:
Enter "keepitsteady" on the cheat menu.
T.H.U.G. Music Code:
Enter "holeshot" on the cheats menu.
Unlock Iron Man:
Beat the story mode to unlock Iron Man from Marvel comics.
Unlock Pedestrian Skaters:
Find every Gap in the game (including in the hidden levels).
Unlock Secrets:
If you complete all 129 goals, you will unlock the following:
Cool Specials
Kid Mode
Roller Skates
Flame
Always Special
Perfect Skitch
Perfect Manual
Moon Gravity
Unlock T.H.U.D.:
Beat the story mode on sick difficulty to unlock T.H.U.D.