Option for mistake

[Schanzation]

Hello! I love this app, but wondering if it is possible to add an option to show if I typed wrong number?

For example as in sudoku. com website when I type the wrong number the number will display in red color.

In this app it will display in green color and have to use the hint to check whether I did a mistake or not and the hint will automatically display the correct number. I don't want to know the correct number. Just want to know when I did a mistake.

More theme/font options would also be a great addition to the app. Thank you.

[sagehane]

Could it perhaps consume a hint or some penalty when activating such feature? Because obviously, people can abuse it for the equivalent of infinite hints.

At the very least, I personally want it turned off by default as I don't want to be spoiled the answer just because I mistyped or forgot to toggle between notes.

Edit:
In hindsight, there actually are so many ways to cheat at Sudoku and the concept of "penalties" make no real sense. However, I do wish if such feature is implemented, it would be toggle-able and be off by default.

[annihat]

@Schanzation, would this be as a disability aid or a learning aid? I like it either way

[chemicalcain]

I would not mind this as a settings toggle, but I prefer the current behavior. The app displays conflicts with numbers that are already on the page, but doesn't tell you if a number you typed is wrong unless there is a visible conflict. This lets me pursue guesses.