Of the great chain of blocks that we can find in Ethereum one of the games that there is this CryptoKitties, a game created by a study from the United States approximately 3 years ago, has a single principle and function that is basically to obtain virtual kittens and breed them by for a while until they have some growth to then sell in exchange for cryptocurrencies, clients can manage and use them within the same platform. In addition to owning collectible cats but this must be acquired with the purchase.