Contact
A size that looks wrong, an object worth adding, a question: write in, everything gets read.
Write
guessitdm@gmail.com — answer within a few days, in English or French.
Report a wrong size
Name the object, the value you suggest and, if you can, a public source. Every size in the game is tied to a source listed on the Credits page: a well-sourced correction is applied quickly.
Privacy
The game keeps no personal data on its server. The privacy policy explains what stays on your device and how to erase it.
Advertising and partnerships
Same address. The game is free and will stay free: it is funded by advertising and voluntary support.