• Restore Health – at the main menu press Left, Right, Up, Down, A (x4)
• Innvincibility – at the main menu press A, Y, X, B, Up, Up, Down, Down
• Armor – at the main menu press A, X, Y, B, Up, Up, Up, Down
• Extra Money – at the main menu press Up, X, Up, X, Down, B, Down, B
• All Blessings – at the main menu press Left, Up, A, B, Right, Down, X, Y.
• Maximum Attributes – at the main menu press Left, B, Up, Y, Down, X, Right, A
• Max Skills – at the main menu press A, Left, Right, B, Down, Up, X, X
• Stronger Attacks – at the main menu press A, Up, B, Down, X, X, Y, Y

Choose skateshop from the main menu, then select buy stuff and access the enter code options. Now you can enter these cheats:

•  ZOMBIEALIVE – Unlocks the zombie outfits.
• BIGSNOWMAN – Unlocks the abominable snowman outfits.
• SNOWSK8T – Enables the always snow cheat.
• MIRRORBALL – Enables the mirror mode cheat.