Pause the game and go to the Cheats selection in the Options menu. Once there, enter the code "backdoor" to unlock everything.

Pause the game and go to the Cheats selection in the Options menu. Once there, enter the code "roadtrip " to enable level select.

Pause the game and go to the Cheats selection in the Options menu. Once there, enter the code "YOHOMIES" to unlock every skater except Doom Guy.

To unlock all of the created skaters (the dudes made up by the developers), enter this code in the Cheat screen: WeEatDirt.

To get all the decks in the game without doing a lick of work, enter this code at the Cheats screen: GiveMeSomeWood.

Unlock the corresponding cheat by beating the Career Mode 100% the indicated number of times:

1: Darth Maul (Skater)
2: Wolverine (Skater)
3: Officer Dick (Skater)
4: Warehouse Level (From THPS1)
5: Private Carerra (Skater)
6: Burnside Level (From THPS1)
7: Ollie the Magic Bum (Skater)
8: Kelly Slater (Skater)
9: Roswell Level (From THPS1)
10: Demoness (Skater)
11: Snowboard Mode (Cheat)
12: Unlimited Special (Cheat)
13: Perfect Rail Balance (Cheat)
14: Super Stats (Cheat)
15: Huge Skater (Cheat)
16: Slow Motion Mode (Cheat)
17: Perfect Manual Balance (Cheat)
18: Small Skater (Cheat)
19: Moon Physics (Cheat)
20: Expert Mode (Cheat)
21: Eyeball Man (Skater)
22: First Person Mode (Cheat)

Pause the game and go to the Cheats selection in the Options menu. Once there, enter the code "PUMPMEUP" to unlock max stats.

Pause the game and go to the Cheats selection in the Options menu. Once there, enter the code "Peepshow" to unlock all movies.