
0 0 3  0 8 0  1 0 0
0 0 0  0 5 0  0 0 0
0 0 0  0 0 0  4 5 0

6 9 2  0 4 0  3 0 0
4 0 8  0 0 0  6 9 5
0 0 5  0 6 0  2 8 4

9 6 7  0 0 0  0 0 0
0 0 1  0 9 0  0 0 0
0 0 4  0 7 0  9 0 0

extreme/impossible
Solving this puzzle requires several
recursion-levels of guessing + KeyCell.
Thusly, this seems the hardest
puzzle in this collection.

Copied from ctc 25may24
ctc[=cracking the cryptic] See:
https://www.sudokuwiki.org/

