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Dragon Sudoku (621)
Instruction:
Apply classic sudoku rules.
Each 9 in the grid sees exactly 8 other cells in the 4 vertical and horizontal directions before a wall is seen. Numbers placed in each of these sets of 8 cells must not repeat.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2016 - Round 7
(37)
Parent puzzle:
Sudoku