Sudoku
A classic logic puzzle played on a 9x9 grid, split into smaller 3x3 squares. You fill empty cells with numbers one to nine so each row, column, and small square contains every digit once. Click a cell, then a number to place it, or use the notes button to mark candidates. Runs in the browser on desktop, phone, or tablet in portrait orientation, with several difficulty levels to choose from. No installation needed.
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About this game
The playing field is a grid with 9×9 cells, divided into smaller grids with a side of 3 cells. Thus, the entire playing field consists of 81 cells. At the beginning of the game, there are already some numbers in them (from 1 to 9). The player is required to fill in the free cells with numbers from 1 to 9 so that in each row, in each column and in each small 3 ×3 square, each digit would occur only once.
There are multiple levels of difficulty you can choose. Beware of mistakes you can make.
How to play
Click on the cell you want to fill and then click on a number you want there. You can click on the "Notes" button to mark possible numbers without placing them.