CKBox is a Chrome add-on developed by Papa. It is a free program that enhances the CryptoKitties website by providing a set of useful additions. With CKBox, users can unlock hidden genes, access kitty history, and view breeding probabilities. The add-on also includes cattribute charts and stats, allowing users to better understand the characteristics of their CryptoKitties. Additionally, CKBox adds jewels to the market and profile list, making it easier to identify valuable kitties. One of the standout features of CKBox is the cattributes popup, which provides detailed information about a kitty's attributes right on the page. With CKBox, CryptoKitties enthusiasts can take their game to the next level with more tools and information at their disposal.