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🔢Games

Playable Sudoku

9×9 Sudoku with board generator and three difficulties (easy, medium, hard). Click a cell and type 1-9. Verify the solution with one click.

Clique numa célula e digite 1-9. Backspace apaga.

Play Sudoku online

There's no more popular logic puzzle in the world than Sudoku. The rule: fill the 9×9 grid with numbers 1 to 9 without repeating in any row, column or block. This version generates fresh, playable boards whenever you want, at the difficulty you pick.

There are three levels, easy, medium and hard, to match your progress or simply your mood for the day. Click the cell, type the number, and when you finish a button checks whether the solution is correct. It trains logic and concentration in a format that hooks you.

No install and no sign-up: the game runs in the browser. Each round brings a different board, so the challenge never ends.

Frequently asked questions

What changes between easy, medium and hard?
Only how many cells get removed from the completed board: easy blanks 40 of the 81 (41 clues remain), medium — the default — blanks 50 (31 clues), and hard blanks 58 (23 clues). Every click on Novo (new game) builds a fresh completed board by random shuffling and then punches the holes, so the same puzzle never comes around twice. Clues sit on a grey background and cannot be changed; the digits you type show up in blue.
Does the check button show me where I went wrong?
It never points at the cell: it compares the whole board against the solution the generator stored and answers only "Ainda há erros." (there are still mistakes) — blank cells count as mistakes — or "✓ Resolvido!" (solved). One honest detail: since the holes are punched at random, in some cases (mostly on hard) the board admits more than one valid solution, and the check only accepts the one the generator knows. There is no live checking while you type either, and no hint or reveal button.
Can I play entirely with the keyboard?
Almost: the first selection takes a click on a cell; from there the arrow keys move the selection, digits 1 to 9 fill it in, and Backspace, Delete or 0 erase. Clue cells accept neither clicks nor typing. There is no pencil-mark mode, no timer and no mistake counter — it is the bare puzzle. On a phone you can tap to select, but without a physical keyboard there is no way to type: the cells are not text fields, so the virtual keyboard never opens.

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