BuildBuild.Fun is a shared city-building game and a catalogue of processed real-city terrain. These notes explain what to expect when playing, posting, and downloading. They were last updated on 24 September 2026.
The game world is shared. Buildings, names, messages, and replies you submit may be visible to other players and may affect their experience. Please build and communicate respectfully. Do not post unlawful, harassing, deceptive, or infringing material, or interfere with the service or other players. The game may change as it develops, including its building rules, terrain presentation, and available features.
The terrain previews and downloads are made for games and exploration. They are processed from public elevation and land-cover data, include resolution limits and classification uncertainty, and are not suitable for navigation, construction, flood assessment, or other safety-critical decisions. A game cell or grayscale pixel should not be treated as a surveyed ground measurement. Source attribution and the current classification method are described in the terrain catalogue and research note.
Accounts use email verification so that game progress can be associated with a player. Keep access to your email account secure. Your use of the site is also described in our privacy notice. If you find a terrain error or a problem affecting the shared world, please report it through the contact channel published on this site when available.