Hit left for sea urchin and right for moss balls! Organize your aquarium and grow lovely moss balls! Moss balls are a fascinating form of marine life -- algae that grows into a velvety ball. They can only be found in Japan and some parts of Europe. Presenting an amazing fusion: a quick-thinking reflex game meets a slow-paced creature training game! Reflex game: -Tap or flick to sort the incoming sea urchin and moss balls! Aquarium game: -Grow sea urchin and moss balls in your very own aquarium -Keep that tank tidy! Add fresh water to your aquarium to keep it clean -Don't neglect your little creatures -- they'll shrivel up and die!