Alex Kidd no Miracle World [Model G-1306]

Hidden Level:
In Lake Fathom, when you come to the first octopus, kill him by punching out the tentacle segments, or you can use the Teleport powder and punch him in the face twice. After you kill him, center Alex over the grey pot and press Down, Down. This will bring you to an underground lake and the southernmost island in the lake.

Continue Mode:
At the GAME OVER screen where your final score is Hold UP and press button 2 eight times and it will say CONTINUE MODE. It will only work if you have at least $400.