CryptoKitties is a game built on Ethereum that allows users collect and breed cryptographically unique creatures called CryptoKitties. Each kitty exists on the Ethereum blockchain as a ERC721 non-fungible token which stores the genome of the kitty. Each kitty has a unique genome that defines its appearance and traits. Players can breed their kitties to create new kitties and unlock rare attributes or "cattributes" as they are referred to in the game.
See the section labelled Genes under the CryptoKitties Guide below.
Gods Unchained crossover
On January 10th, 2019, a partnership between CryptoKitties and the trading card game Gods Unchained was announced. Between Jan. 10th to Jan. 21st, 2019, CryptoKitty owners were able to forge a Talisman statue in Gods Unchained. 380 Special-Edition Gods Unchained Aeoncat Kitties were also released including Tally the Purrocious and Hypurrion, modelled after GU's Hyperion.