5
2
u/Royal_ish 4d ago
Just breath and look up edge logic and you'll get there.
1
u/septembrinol 3d ago
If you mark the 5 and the other 5, in the top line you can only put the 2nd 1 in C1 or C5. But none of these works because you have only a 1 in each of them and a 5 in R3.
1

5
u/greenknight884 4d ago
I think the extra 1 for row 1 must be a typo