(L2: #838377991)
What is Sudoku? It is a puzzle game that needs your logical thinking skills to solve.
Play free Sudoku puzzles online. Also a touch screen friendly version is available for your smartphones and tablets.
Never play enough Sudoku? Billions free Sudoku puzzles availabe here online.
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Pencil marking mode will be activated when this option is checked AND at least 2 digits are entered in a square. You may use background highlight option when making a guess. These two options are very useful when solving difficult puzzles with advanced techniques.
Use mouse to select (click on) a digit on the right side bar first and then click on the square where you want to place the digit in the grid. To switch to keyboard (the default mode), simply press the keyboard button. When finished, press 'Done'.