Initially activate the "Auto" option for converting single digit pencil marks into regular entries (only for initial setting, not changing the current mode).
Automatically check if the puzzle is correctly solved.
Show numbers of digits yet to be filled.
When highlighting all related cells, highlights follow your cursor movements. (Otherwise follow your clicks.)
What is Sudoku? It is a puzzle game that needs your logical skills to solve. The objective is to fill in the 9x9 Sudoku grid with digits 1 to 9 such that each of these 9 digits appears in each row, each column and each 3x3 sub-grid once.
Don't want to solve the same Sudoku puzzles again and again? Now you no longer need to search the web for new Sudoku puzzles. Billions of free Sudoku puzzles are offered here online. The chance that you will do the same Sudoku puzzles is almost zero.
Play our billions of Sudoku puzzles on your mobile devices such as tablets and smartphones. If you have a large screen phone, try both versions to see which one is a better fit for your device. We also encourage those mouse-only PC players to try our Sudoku Mobile page that has a "Cell First" option for entering multiple pencil marks in one cell at a time.
Under the pencil mark mode, if you prefer all new single digit entries to be in normal font size (i.e., no single digit pencil marks), just check the "Auto" option on the left. May also check the first option below the grid to change the default setting.
First click to select a digit on the right side bar. Then click on the square in the grid where you want to place the selected digit. To switch back to the default keyboard mode, simply press the keyboard button. When finished, press "Done".