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X-One Sudoku (625)
Other names:
X ray Sudoku
Instruction:
Apply classic sudoku rules.
The number placed in a circled cell must appear exactly once on each of the two marked diagonals passing through that cell.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2016 - Round 8
(104)
Parent puzzle:
Sudoku