Easy points for secret characters
Find a large ramp to do tricks off. Do a trick, then turn around and do it again. You can take as long as needed to build the points. Now, finish the race to unlock the secret character. This can be done on any track that you still need points for a secret character.

Black Diamond track
Win championship mode as any character to unlock the Black Diamond track.

Rival challenge mode
Win the game in championship mode as any character to unlock rival challenge mode.

Losing sleds in rival challenge mode
Do not challenge a rival on a track that you cannot win. If you challenge a rival and lose to him or her, the sled you used will be lost and have to be unlocked in championship mode again.

PS2 Cheats for Sled Storm 2

Sled Storm 2 cheat codes

Sled Storm 2 cheats