Country sudoku
A free sudoku-style puzzle with a different country on every level.
Worlddoku is a world sudoku you can play in your browser. Each of the 30 countries has an easy, a medium and a hard board, and every stamp you place is something that country is known for, from a sardine in Portugal to a torii gate in Japan.
How it plays
- The board is split into coloured regions. Place exactly one stamp in every region.
- Each row and each column holds exactly one stamp.
- No two stamps touch, not even diagonally.
Every board has one solution, and you can always reach it by reasoning. You never need to guess.
Worlddoku and sudoku
- Sudoku fills a 9×9 grid with the numbers 1 to 9. Worlddoku places one stamp per row, column and region on boards of 5×5, 7×7 and 9×9.
- The logic is the same kind of deduction: rule out cells until only one choice is left.
- The twist is the no-touching rule and the countries. Finishing a level adds that country's stamps to your passport.
Choose a country
Start at Portugal and travel round the world, or jump to any country.
- PortugalLevel 1
- SpainLevel 2
- FranceLevel 3
- ItalyLevel 4
- GreeceLevel 5
- TurkeyLevel 6
- EgyptLevel 7
- MoroccoLevel 8
- EthiopiaLevel 9
- KenyaLevel 10
- South AfricaLevel 11
- IndiaLevel 12
- NepalLevel 13
- ThailandLevel 14
- VietnamLevel 15
- IndonesiaLevel 16
- ChinaLevel 17
- South KoreaLevel 18
- JapanLevel 19
- AustraliaLevel 20
- New ZealandLevel 21
- PeruLevel 22
- BrazilLevel 23
- ArgentinaLevel 24
- MexicoLevel 25
- United StatesLevel 26
- CanadaLevel 27
- IcelandLevel 28
- NetherlandsLevel 29
- IrelandLevel 30
Prefer the geography side? See how Worlddoku works as a geography puzzle game.
Questions
What is country sudoku?
Country sudoku is a sudoku-style logic puzzle themed on countries. In Worlddoku every level is a different country, and you place one stamp per region, row and column using deduction alone.
Is Worlddoku the same as sudoku?
No, but it shares the spirit. Both have one solution that you reach by reasoning, and both use rows and columns. Worlddoku has no numbers: you use coloured regions and a rule that stamps may not touch.
How is it different from Murdoku-style or Queens-style puzzles?
Murdoku-style puzzles are whodunit grids, and Queens-style puzzles place one item in each coloured region. Worlddoku is closest to the second kind, with the no-touching rule, a country on every level and stamps to collect.
Do I need to know sudoku to play?
No. The rules take a minute to learn, and the first levels are small 5×5 boards. Hints explain the next step in words if you get stuck.
Is it free?
Yes. It is free to play in the browser with no account, and your progress is saved on your device.