Skeleton Warriors

Infinite Lives
Pause the game. B, A, Down, B, A, Left, Down, Right, Y, Up.

Infinite Crystals
Left, A, Z, Y, C, Right, A, B, B, Y, Down, A, Down, Down, Y.

Invincibility
C, Right, A, Z, Y, Left, A, Right, Down, B, A, B, Y.