Enter these codes for the desired effect. The button names reflect the original Genesis controller.

Effect	How to unlock
Add one life	Pause the game and press UP, DOWN, A, B, C, LEFT, RIGHT, C, B, A.
Cheat menu	Pause the game and press B, A, C, A, DOWN, A, C, A, RIGHT, A, B, UP, RIGHT, UP, B, UP, RIGHT, UP, DOWN, A.
Stage select	When STAGE 1 START appears, press B, B, C, A, UP, DOWN.