You got these two cheats if you purchased Tony Hawk's Downhill Jam from Best Buy stores. Just go to "Skateshop" on the main menu screen. Then to "Buy Stuff" and then to "Enter Code" and enter the following codes:

BIGSNOWMAN - Unlock Abominable Snowman Outfit(s)
ZOMBIEALIVE - Unlock Zombie Skater Outfit(s)

I was at kilimanjaro at the second challange snowy competition and I was at the mountain by the big hill thing and on the moutain wall I did a wall ride and moutain board appeared on the screen then the boards immeaditly changed???I think it did that origanally because the whole race has the mountain board section but the snowy competition only does snowboarding you'd have to play it to understand mee!?!?!?!?

You got these two cheats if you purchased Tony Hawk's Downhill Jam from Target stores. Just go to "Skateshop" on the main menu screen. Then to "Buy Stuff" and then to "Enter Code" and enter the following codes:

SNOWSK8T - Unlocks the "Always Snowskate" Cheat
MIRRORBALL - Unlocks the "Mirrored Maps" Cheat