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Nintendo DS - Tony Hawk's Downhill Jam cheats

Go to the main menu, then choose the "Skateshop" option, thjen go to 
"Buy Stuff" option, then choose the "Type Code" option.

Type any of the codes bellow to unlock to activate the indicated cheat effect:

Always snowskate:
Type "SNOWSK8T" as a code

Mirrored maps:
Type "MIRRORBALL" as a code

Unlock Abominable Snowman outfit:
Type "BIGSNOWMAN" as a code 

Unlock Zombie Skater outfit:
Type "ZOMBIEALIVE" as a code 

Note: 
You have to finish the story mode first, to buy cheats without using the 
codes.