Tony Hawk's Downhill Jam
Cheats:
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At the main menu, select the Skateshop option, choose the Buy Stuff
selection, then choose the Enter Code option.
Then, enter the following codes to unlock the cheat:
Always snowskate
Enter SNOWSK8T as a code.
Mirrored maps
Enter MIRRORBALL as a code.
Abominable Snowman costume
Enter BIGSNOWMAN as a code to unlock the Abominable Snowman costume.
Zombie Skater costume
Enter ZOMBIEALIVE as a code to unlock the Zombie Skater costume.