Ive been making sudoku for a high school project and I need help getting it to check the groups of 9 boxes. It already checks the vertical and horizontal rows but not the boxes. I need to find a consistent formula to change it to the right section.
atm for the vertical and horizontals the formula is ... (Int((i - 1) / 3) * 10), i need one for the sections of 9. Any help would be appreciated. thanks