Miss Muffet

The board from which to choose a number to fill the chosen spot on the sudoku should not cover the game board.
There should be a “clear" button to remove the wrong input.
Where’s the pencil feature? On higher, i.e. difficult level, the player should be able to utilize the pencil in feature.
There should be an indication that a number is completely utilized. As the sudoku is solved, one or more numbers will be used up. The player needs to see this feature.
I will play this game again once the updates to incorporate the above suggestions are done. Thank you.

Big senior fan about Sudoku 9x9, v1.02