Very nice, particularly enjoyed the video (I did not know the original game). Could be improved on the sharing part! (Is puzzle the same for everyone?). A first

Very nice, particularly enjoyed the video (I did not know the original game). Could be improved on the sharing part! (Is puzzle the same for everyone?). A first idea: green squares for numbers on top used, yellow squares for intermediate numbers where used. Green square for final solution. Black (or similar) circle for operations. Black squares for other numbers