At the main menu, select the "Skateshop" option, choose the "Buy Stuff" selection, then choose the "Enter Code" option. Enter the following codes to unlock the corresponding cheat. Note: To purchase cheats without using the codes you must first complete Story mode.
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.
Enter the Wireless selection screen, choose "Local Game", then select "Host A Game". You will now be able to choose any character and track desired, even if it has not been unlocked.