If you have tried Cryptokitties, you'll have to try Pray4Prey. Its an Ethereum blockchain aquarium that lets you buy fish and see if they can be a survivor of a shark attack. Everytime a shark attacks and a fish dies, the value of that fish gets divided among the fish left surviving. The longer fish stays alive, the bigger and older it gets. To play you will need to have ethereum and metamask, just like what needed with Cryptokitties. Go ahead and try it out!!