Welcome to the official CryptoKitties Guide, your one-stop-shop for all things CryptoKitties! Here you’ll find the basics on how to play the game as well as advanced tips and tricks to become a skilled breeder. This section outlines the basics of how to play CryptoKitties: buying, breeding, selling, and siring. Every action in CryptoKitties requires a Gas fee be paid to the Ethereum network. This section explains Gas and how it works. Every Kitty’s appearance gets determined by its unique set of genes. This section explains genes, how they work, and how they get passed on from parents to new Kitties.