For PC Users Only: When highlighting all related cells, highlights follow your cursor movements. Otherwise they follow your clicks. (Always follow your clicks on touchscreen.)

Sudoku Mobile

This touch screen friendly version allows you to play Sudoku puzzles on your tablets (landscape or portrait) or on your smartphones (portrait) online. It is also recommended for mouse-only PC players.

Besides the "Pencil Mark" and "Cell Highlight" options, some new features ("Cell First", "Redo" and more) are added to this interface to make it easier to play. Try and explore yourself. Hope you like it. Enjoy!