ell, all possible entries that will not contradict the One Rule with respect to the

n cells. If a celle ends 🎉 up having only one possibles entry, it is a "forced" entre

you should fill in. The Math Behind S

the fact 🎉 that every row, column and block must

ntain each of the numbers 1 to 9 once. Therefore, the total of all 🎉 num bers in one roW,