Sudoku - want to be able to pencil in numbers

I'm frustrated by all the Sudoku games on here because they don't seem to allow you to "pencil in" possible numbers for a given cell. That's the way I've learned to do Sudoku, so it's pretty difficult to do otherwise. Without the possibilities matrix, it seems like just a guessing game.

Thank you for your message. We will investigate to see what we can do with that