Blockchain games are gaining traction as a novel way to engage players, with major gaming companies like Square Enix, Nexon, and Ubisoft exploring the technology, though it is not universally applicable, particularly for fast-paced games like first-person shooters due to blockchain's limited speed and scalability. On-chain games, a subset of blockchain games, operate entirely on blockchain technology, with game logic and state stored in smart contracts, offering benefits like decentralization, digital permanence, and composability, but facing challenges such as limited speed, transparency issues, and susceptibility to botting. Despite these challenges, on-chain gaming allows for technical innovation and aesthetic diversity, enabling different user interfaces for the same game. Examples of on-chain games include HunterCoin and Dark Forest, both serving as experiments in decentralized game development and technology. The niche yet expanding community of Web3-native developers and players continues to explore and push the boundaries of what is possible with fully on-chain games.