Tony Hawk’s Downhill Jam – Nintendo DS

Tony Hawk's Downhill Jam - Platform: Nintendo DS

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.