Happy Oyster is an open-ended AI “world model” platform designed for real-time world creation and interaction, enabling users to generate, explore, and continuously evolve immersive 3D environments from simple prompts. Instead of producing a fixed output, it operates as a living system that responds dynamically to user input, allowing scenes to update in real time as instructions are given through text, voice, or images. It supports multimodal interaction and maintains consistent physical logic, including lighting, gravity, motion, and scene continuity, so that generated environments behave like coherent, persistent worlds rather than isolated clips. It introduces two core modes: Directing, where users actively control scenes, adjust camera angles, guide characters, and shape narratives as they unfold; and Wandering, where users can freely explore an infinitely extendable world in a first-person perspective, moving beyond initial frames.