
9 0 1  5 0 0  0 4 6
4 2 5  0 9 0  0 8 1
8 6 0  0 1 0  0 2 0

5 0 2  0 0 0  0 0 0
0 1 9  0 0 0  4 6 0
6 0 0  0 0 0  0 0 2

1 9 6  0 4 0  2 5 3
2 0 0  0 6 0  8 1 7
0 0 0  0 0 1  6 9 4

hiddenQuad ex1 (partly solved)
center box: 1469
