Build0 is a web based platform described as a persistent 3D world for builders. Users can claim a space within this shared environment to create playable experiences and construct objects with the assistance of an AI agent. The platform is currently in active development, meaning that features, controls, and overall functionality may change as improvements are made. The project is positioned as a city in the making, with a focus on community contribution and ongoing refinement of building tools and game features. The primary function of Build0 is to provide users with a blank plot in a shared world where they can build something unique. The workflow involves claiming a space, then using the available tools to design and construct within that space, optionally collaborating with an AI agent to enhance the building process. The platform emphasizes that it is a space for new ideas, encouraging users to experiment and create. Main features include a persistent 3D environment, the ability to claim and own a plot, a set of building tools that are still being refined, and integration with an AI agent to assist in creation. The platform also invites user feedback through a support channel, allowing users to report issues or suggest ideas. As the platform evolves, layouts, controls, and platform behavior may be adjusted. No specific technical requirements are listed on the website. Overall, Build0 serves as an experimental digital sandbox for builders and creators who want to participate in shaping an evolving virtual city. It is suitable for users interested in collaborative world building, game design, or AI assisted creation in a persistent online space. The project is openly under development and encourages early adopters to help shape its direction.