Magnum Kiki Ippatsu Cheats

When you beat the final boss of the last stage, stage 5-8, if you haven't found the key in an earlier stage you will go all the way back to stage 5-1.

You will find the key by shooting at crates in stages 5-1 through 5-7. If you uncover the key, shoot it and your score will be displayed in gold instead of the usual white. Now when you beat the boss of stage 5-8, you will be able to open the door to the real final boss, El Nino.