Say you're stranded on an island with a couple of adorably helpless anime children. For ... oh, the third time. You're going to be there for a while, doing your best to survive, keeping a fire going, looking for food, defending yourself and your completely useless companions.
When you aren't collapsing from exhaustion and malnutrition, why not make the best of your time by learning dolphin language? Konami's Lost in Blue 3 contains a new dolphin communication minigame, a rhythm game in which you speak into the DS microphone in time with musical notes. Maybe if you get close enough to the dolphin society, they'll lend you one of their submarines!