
0 0 0  5 0 0  8 0 0
0 0 0  0 0 2  0 1 0
3 0 0  0 6 0  0 0 4

0 0 2  0 0 9  0 0 0
8 0 0  6 0 0  0 0 5
0 7 0  0 0 0  3 0 0

0 0 3  0 0 0  0 0 2
0 1 0  8 0 0  7 0 0
5 0 0  0 0 4  0 9 0

#546 beyond extreme
update 14aug23: keycell now works to solve!!!

