NINE DIGITS ACROSS CONNECTED SQUARES

Fill all the empty cells in the Sudoku so that every row, column and 3x3 box has the numbers 1 to 9 without any number repeating. The board is made up of 81 cells and the starting numbers give the clues to work out the rest of the placements. This logic puzzle links each decision to three areas of the grid. Checking where a digit already appears helps eliminate unsuitable cells, while a confirmed placement can narrow the possibilities elsewhere.

Select Cells and Record Candidates

Choose Play, use the displayed arrows to select a difficulty, and select it to begin. To enter a number, select an empty cell and then choose a numbered tile beneath the grid. Selecting a filled number highlights matching digits across the board. Click the pencil icon to record possible answers as notes rather than confirmed entries; candidates disappear automatically when later placements rule them out.

To erase an entered number, select its cell and choose the matching numbered tile again. These controls let you compare existing digits, track alternatives, and revise entries while solving.

How Do Difficulty and Penalties Work

Sudoku has four difficulty levels: Easy, Medium, Hard and Expert, with the higher levels having less starting numbers. The grids are randomly generated so you get varied layouts and the timer keeps track of how fast you finish.

If Allow Errors mode is on , repeated digits get reported , but wrong entries have no time penalty. 15 seconds for each false move if you switch it off.

WHEN EVERY CELL FITS THE RULES

Number highlighting and candidate notes support a deliberate approach based on elimination of options. The Daily Challenge also has times compared on a daily leaderboard, and adds a timed objective to accurately finishing the grid.

Solve Sudoku by checking each candidate against its row, column, and box.