Insert credit and keep holding A, B and C on the player 2 side while entering the codes.

Code	Effect
C, C, C, A, Up, Left, Right, Down, B, C, C, C, Down, Down, A, B, C, B, A.	Unlock extra stage
Up, Up, Up, Up, B, B, A, A, Left, Left, Right, Right, C, C, C, Down, C.	Unlock Follet
C, B, A, C, B, Up, A, Right, C, Left, B, Down, C, B, A, A, A.	Unlock Rosa