Use Controller 2 and press the following at the title screen: Left, Right, Start, C, A.
At the title screen press on controller 2 Up, Left, C, B, and A.
At the title screen on Controller 2, press: Start, C, B, A, Right, Left, Right, Left.
When you feel like jumping ahead, press Start and then C to skip levels.
Secret Mode Unlock
When the Sony logo appears hold the A, B and C buttons and Gabe should replace the logo. When you go to the main menu there will be a new mode that allows you to throw snowballs and make snowmen.
At the title screen on Controller 2, press: A, B, C, Down, Up.
Time Trial Snowboarding
At the title screen on Controller 2, press: C, B, A, Up, Down, Left, Right, Start.