CryptoKitties is a blockchain-based game that allows players to breed, buy, and sell virtual cats. Launched in November 2017, it was one of the first successful applications utilizing blockchain technology for digital collectibles. Each CryptoKitty is unique, represented as a non-fungible token (NFT), and has distinct traits and characteristics.Players can create new CryptoKitties by breeding two existing ones, resulting in offspring that may inherit features from both parents. The rarity of each cat varies, affecting its value; some cats can sell for thousands of dollars.The game gained significant attention for highlighting the potential of NFTs and for its scalability challenges, which resulted from the large number of transactions. This led to network congestion on the Ethereum blockchain, where the game is built.CryptoKitties not only popularized the concept of digital collectibles but also opened doors for other NFT projects, influencing the way virtual assets are created, traded, and owned.