Blockchain technology is opening new horizons in many arenas. Some are still being studied while others have already proven their success and are now developing at lightning speed. Blockchain games belong to the second category. The smashing success of CryptoKitties, Parsec Frontiers, Decentraland, and other projects demonstrates that blockchain can be applied to games in rewarding ways, and it is paving the way to revolutionary ideas. In developing 0xUniverse, we studied and took into account the experience of our predecessors, and introduced new ideas: