As the most direct experience portal of the "metaverse", games are deeply intertwined with the vision of "post-human society". The work aims to trace back to the current "metaverse-like" digital games, so as to map the ecological composition and design evolution of future games under the background of metaverse. Through case analysis and comparative analysis, the essential characteristics and design principles of digital games, the creation law of game ecology and operation mechanism, and the possible hidden risks in game ethics under the background of the future metaverse era are analyzed. It can be predicted that the future metaverse game design will be upgraded and reconstructed in terms of technology, time and space, narrative, experience, transaction, organization, operation and social integration. In the face of the open and flat game ecological relationship, human beings should be cautious about the existing social rules and ethical bottom line that media succession may impact, so as to carry out rational risk avoidance in advance.