(Click photos to enlarge)
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,
