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Sudoku is a classic logic puzzle built around a 9x9 grid with some numbers already placed. Your task is to use deduction to complete every empty cell so that each row, column, and 3x3 box contains the digits 1 through 9 only once. The challenge comes from working carefully through the board, spotting conflicts, and choosing the next safe move. This browser version is easy to open on desktop or mobile, so you can solve a quick puzzle or spend longer on a harder grid whenever you want.
Sudoku is a good choice for players who enjoy calm but demanding logic puzzles. It fits short breaks well, yet the harder grids can take real concentration and planning.
9x9 number grid with 3x3 sub-squares to track.
Multiple difficulty levels for different skill ranges.
Notes mode for marking possible numbers before committing.
Mistake-prone puzzle structure that rewards careful deduction.
Playable in a browser on desktop and mobile devices.
Fill every empty cell with a digit from 1 to 9.
Keep every number unique within each row.
Keep every number unique within each column.
Keep every number unique inside each 3x3 square.
Use logic and notes to avoid placing conflicting numbers.
Select an empty cell on the grid.
Choose the number you want to place there.
Use notes mode to mark possible candidates before deciding.
Check rows, columns, and 3x3 squares for repeated digits.
Keep filling the grid until every cell is solved.
Use the on-screen controls to select cells and numbers.
Follow the in-game prompts for notes and input.
Tap carefully to avoid placing the wrong digit.
Use the mouse to select a cell and place a number.
Follow the in-game prompts for notes if available.
Start with rows, columns, or boxes that already contain many numbers.
Use notes to narrow down candidates in harder sections.
Scan the same number across the board to spot safe placements.
Avoid guessing unless you have ruled out all other options.
English
Fill the board so each row, column, and 3x3 square contains the numbers 1 to 9 without repeats.
Yes, the game includes a notes option for tracking candidate numbers before you place them.
Yes, you can solve a single grid in a short break or spend more time on a harder puzzle.
Watch for mistakes that can block later moves.
If supported, keyboard input may help with faster entry.
