Worlddoku: a free country logic puzzle
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How Worlddoku works
Worlddoku is a free country sudoku-style puzzle, a little like a world sudoku. Every level is a country. Place one stamp in each colored region so that no two stamps share a row or a column, and no two touch, not even diagonally. There is always exactly one solution, and you can always reach it by reasoning. Collect the stamps and fill your passport.
New here? Read how to play, browse all 90 levels, or pick up a few solving tips. Wondering how it compares with sudoku? Read about country sudoku.
Curious where the stamps come from? Browse the 30 countries.
Questions
What is Worlddoku?
Worlddoku is a free logic puzzle in the browser. Each level is a country: you place stamps on a board split into coloured regions, and every stamp is something that country is known for.
How do you play Worlddoku?
Place exactly one stamp in every coloured region, with one stamp in each row and each column and no two stamps touching, not even diagonally.
Is Worlddoku like Sudoku?
It has the same spirit: every puzzle has one solution you reach by pure deduction, and each row and column holds one item. Instead of numbers you use coloured regions and a no-touching rule, similar to Queens-style region puzzles.
Do I have to guess?
No. Every level has exactly one solution that can be found by reasoning. If you get stuck, a hint explains the next logical step in words, and every level has a step-by-step guide.
Is Worlddoku a geography game?
It is a logic puzzle with a geography theme. Every level is a country, and each stamp you collect is something that country is known for, with a short note about it.
How many levels are there?
There are 90 levels: 30 easy (5×5), 30 medium (7×7) and 30 hard (9×9). Level 1 to 30 each visit a different country, from Portugal to Ireland.
Is Worlddoku free, and do I need an account?
It is free, and no account is needed. Your progress is saved on your own device.
Can I play on my phone?
Yes. Worlddoku works in the browser on phones, tablets and computers.