The New Sudoku Players' Forum

[xxyyzz]

The number in gray box needed to be smaller than the numbers in the white boxes that are above, below, left and right of the gray box. In other words, this is the reversed of Fortress Sudokus. Please see the attached file.

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[creint]

Valid solution, 1 layer of locked singles required.

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