Sudoku for beginners

Sudoku Newbie is a Sudoku game with helper, solver and background music.
You can select hint method and play it for either skill practice or relaxation.
It is suitable for all ages. You can select difficulty level to play, starting from
to fill a single empty cell in each row or column up to the stardard level.The
custom level is a blank table that let you put any given values. The solver
can solve a puzzle up to the standard level (i.e. Singles, Intersections, Pairs,
Triplets and Quads).

Usage :-

Touch a cell in the table as desire. Touch an input button below the table to
fill the value. The right-side buttons are

C Clear the selected cell
< Undo
> Redo
# Touch and draw to any cell to show only the possible input buttons that can
be selected
O Touch and draw to any input button to see which cells can be filled.