About and contact

Worlddoku is a free logic puzzle where every level is a country.

What it is

Place one stamp in every coloured region, with one stamp in each row and column and none touching. There are 90 levels across 30 countries, and every board has exactly one solution you can reach by deduction. Start with how to play or browse the countries.

Contact

Feedback, a bug, or a country you would like to see? Write to hello@worlddoku.com. If something looks wrong on a level, mention the difficulty and level number.

Your data

There are no accounts. Your progress, theme choice and passport photo are saved in your own browser and never sent to a server, so clearing your browser data erases them. The site loads its fonts from Google Fonts, and the pages are served by Cloudflare. The site may count page views with privacy-friendly analytics that use no cookies.