Once and Future is an adventure game in which players explore a blend of historical and fantasy settings, solving puzzles and uncovering mysteries as they navigate through different eras. In this game, a soldier in Vietnam is mysteriously transported into an Arthurian legend, moving between various historical and mythical worlds, which challenges players to adapt to diverse environments and storylines. It stands out with its unique combination of real-world history and legendary fantasy, featuring complex narrative layers, immersive environments, and advanced puzzle mechanics that require critical thinking and exploration.