At the Options screen, press Select 40 times.

Before you can do this code you have to beat the special stage. After you beat the special stage in all three categories you will have access to the snowboarder "Snowman". Start a new game, then choose the best Alpine board by pressing Up, Circle, and Triangle.

To access the special course, beat every course in all categories (best time, best tricks, and most points.)

To do extra grabs press and hold a direction and R1 or R2. You should do either a backside grab, frontside grab, stalefish, japan, mute, or an indy grab. R1 is a tail grab and R2 is a nose grab.