BuildBuild.Fun is a browser-based shared city-building game and real-terrain catalogue. This notice describes the data used by the site as currently implemented. It was last updated on 24 September 2026.
You can browse terrain pages without signing in. To save an account across devices, you provide an email address and verify an eight-digit code. The service stores your account identifier, email address, preferred language, profile name if you set one, sessions, and game state such as buildings, currency, messages, and replies. Posts and buildings you create in the shared world can be seen by other players. Verification codes are checked using stored hashes; the service sends sign-in and relevant game-notification email through Cloudflare Email Service.
The browser keeps some preferences and performance data on your device, including language, camera position, and cached public game data. A session cookie lets the site recognize a signed-in browser. The hosting and API infrastructure run on Cloudflare; normal technical request information, such as IP address and browser details, may be processed to deliver the site, protect accounts, and diagnose failures. We do not treat a terrain-page visit as an account signup.
Google AdSense code is currently limited to the home page and manually written articles; game screens, directory pages, and generated city pages do not load it. If Google serves ads, Google and other advertising vendors may use cookies or similar technologies to select and measure ads based on visits to this or other sites. You can review Google's advertising technology information and manage personalized ads in My Ad Center. Ad availability and choices may differ by region; this page is not a substitute for any consent prompt required where you live.
The terrain catalogue uses public geographic datasets from Natural Earth, AWS Terrain Tiles, and ESA WorldCover. City previews and downloadable maps are processed game data. The site does not include your account email in terrain downloads or public city search results.