Sudoku

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You have solved every puzzle at this level.

Print US Letter A4

How to play

Fill the grid so that every row, every column and every 3x3 box contains each digit from 1 to 9 exactly once.

Every level has its own page. A puzzle's level comes from the hardest technique it needs, not from how many digits are given.

Does every puzzle have just one solution?: Yes. Before a puzzle goes up, we check that it has exactly one solution and that our solver reaches it by logic alone.
Will I ever have to guess?: No. Every puzzle can be solved one logical step at a time. If you get stuck, the hint button shows the next step and explains why it works.
Can I print the puzzles?: Yes. Under every puzzle there is a link to a one-page PDF. The printout has no solution on it, and its link opens the same puzzle here, with hints.
Does it work offline?: Yes, after your first visit. The site keeps its pages and the levels you have opened in your browser, so they still play without a connection.
Is it free?: Yes. Every puzzle on the site is free to play. There are no ads and no accounts.
Where is my progress saved?: In your browser. Your progress, times and streaks never leave your device, and clearing this site's data in your browser deletes them.