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Battenburg Sudoku (131)
Instruction:
Apply classic sudoku rules. Everywhere 2 odd and 2 even digits form a 2x2 chessboard pattern, a Battenburg marking is given. If there is no marking, the above pattern is not allowed.
Reference:
WPF
(1)
Examples:
WPF Sudoku GP 2017 - Round 5
(6)
WPF Sudoku GP 2019 - Round 1
(124)
WPF Sudoku GP 2020 - Round 3
(150)
WPF Sudoku GP 2021 - Round 8
(164)
Parent puzzle:
Sudoku
Related puzzles (1):
Battenburg
Related puzzles (2):
Battenburg Little Killer Sudoku