Endorsed by the likes of Nike and Adidas, The Sandbox is a blockchain-based play-to-earn 3D metaverse game built on the Ethereum network. Its players can explore the virtual surroundings, visit different locations in the metaverse, purchase land in the form of non-fungible tokens (NFTs), and build structures and experiences to earn income. The users own all in-game NFTs — verifiable on the blockchain — which provides more opportunities for earning.