CryptoKitties, created by Dapper Labs in 2017, holds the distinction of being the pioneering decentralized open-source game that brought NFTs into the mainstream. Initially, it faced a gradual uptake, but as the NFT frenzy took hold, its popularity skyrocketed, attracting a staggering 1.5 million users.

Within this game, players engage in a multitude of activities such as collecting, breeding, purchasing, and selling cats, each possessing unique traits and rarity levels. These feline companions are represented as NFTs, enabling players to generate profits within the game itself or by trading them on various NFT marketplaces.