At the cheat screen enter...Up, Up, Down, Down, Left, Right, Left, Right, B, A, B, A.

At the cheat screen enter... Down, Right, Right, Down, Left, Down, Left, Down, Right, Right, Right.

At the cheat screen enter... S, K, E, L, E, T, O, N

Enter Up, Down, Up, Down, Left, Right, Left, Right, A, B, A, B, S

Enter Left, Left, Left, Left, Right, Right, Right, Right, Left, Right, Left, Right, Up

Enter Q, U, E, Z, D, O, N, T, S, L, E, E, P

Enter J, U, S, T, I, N, [Space], B, A, I, L, E, Y

Enter B, I, G, U, P, Y, A, S, E, L, F

Enter Left, Left, Right, Right, Left, Right, Down, Up, Up, Down, A, I

Enter B, A, K, A, B, A, K, A

Enter K, H, U, F, U

Completing just the normal challenges in a level will unlock its specific FMV video.

Completing both normal and hidden challenges opens up the following:

Movie Lot: The Bride
Civic Center: Goddess
Industrial: Junkie
Boardwalk: Captain
Cannery: Diver
Airfield: Bombshell
Museum: Mummy

Pick up all of the juice boxes in a stage to unlock a new cheat code.

Completing both normal and hidden challenges on every level will unlock the power skates.

Completing every level with 100% gives you the ultra skates.

Change the month of your Xbox's calendar to December. You'll see the Civic Center full of snowmen.