Hyokkori Hyoutan Jima - Hyoutan Jima no Daikoukai (ひょっこりひょうたん島 - ひょうたん島の大航海) - Cheats

Invincibility

Turn on the console holding [1] + [2] and wait for the Sega logo to finish (you can skip it by pressing [Start] ).

Press [1] x8, [2] x8, [Start] on the title screen. Use [1] and [2] to select the level (displayed at the top of the screen).