Sudoku Players' Forum (clone)

It's great to teach kids how to play (I try with my little daughter (5 yeras old).

But once printed in B&W it's difficult.

What would be great is to have exactly the reverse of what the program proposes.

Instead of playing colors, it would be playing with forms.

Instead of forms indicating the type of entry (clue, hint, wrong,...), it would be colors...

NO ???