Initially activate the "Auto" option for converting single digit pencil marks into regular entries (only for initial setting, not changing the current mode).
When highlighting all related cells, highlights follow your cursor movements. (Otherwise follow your clicks.)
Want to compete with other Sudoku players in the world? Now you have that opportunity through our online daily Sudoku challenge. Every day one new Sudoku puzzle will appear on our website for 24 hours. During this period the top 10 best times will be recorded and listed on our website. See how well other players can do. Maybe you are actually one of the best players in the world!
Our new smart solver not only gives the solution for a puzzle, but also explains every step with demonstrations in the grid. You may learn Sudoku solving techniques through examples with numerous puzzles from our database. Try Smart Solver now.
First select a digit on the right side bar. Then click on the cells where you want to place the selected digit. You may enter more than one digit in a cell as a note by activating the pencil mark option near the upper left corner of the grid.
Best Time so far: 03:43
Press the button below to start this challenge.