Throughout the game, you are in control of Momotaru, whether he is piloting his ship across the ocean, or walking around on an island or an enemy ship. When piloting his ship around the ocean, you can navigate to any location within a square perimeter. If you attempt to sail too far outside that limit, your ship will begin to slow, and eventually come to a stop. The word "STOP" will appear on the screen to indicate that you may not travel any further in that direction, and you will be forced to turn around.
Momotaru will disembark from his ship when he encounters another ship at see, or when he visits the dock gate of an island for which he has already collected the key. Once he is walking around, he can jump, and he is vulnerable to attack. Momotaru has a collection of life points whose current total can be seen in the upper left hand corner of the screen. These points double as a score, and increase every time Momotaru successfully attacks enemies with an object. Whenever one enemy is struck, Momotaru gains 10 points. If a second enemy is struck by the same object, Momotaru earns 20 points, and if a third enemy is struck, he gains 40, and so on. Other objects such as fruit or POW icons will also increase Momotaru's health. Momotaru will die if his life points reach 0.