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Quad Max Sudoku (953)
Instruction:
Apply classic sudoku rules. An arrow on a grid point points to the highest digit in the four cells around it. Digits may repeat around an arrow, but the highest digit is always unique.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2020 - Round 3
(150)
Parent puzzle:
Sudoku
Related puzzles:
Quad Sums Sudoku