Battenberg Sudoku
Battenberg Sudoku was likely first introduced by Bram de Laat for the Daily Sudoku League in February 2013. The variant is sometimes spelled Battenburg Sudoku, referencing “Battenburg markings” — the distinctive checkerboard pattern used on emergency vehicles — and also evoking the visual look of a Battenberg cake.
In this puzzle, every 2×2 block that contains exactly two odd and two even digits arranged in a checkerboard pattern must be marked, and all given marks indicate such configurations. This additional parity-based constraint expands on ideas from Odd/Even Sudoku, adding new layers of deduction and pattern recognition.
Battenberg Sudoku enriches the classic sudoku framework with fresh logical structures, making parity balance and local 2×2 interactions central to the solving experience.
In this puzzle, every 2×2 block that contains exactly two odd and two even digits arranged in a checkerboard pattern must be marked, and all given marks indicate such configurations. This additional parity-based constraint expands on ideas from Odd/Even Sudoku, adding new layers of deduction and pattern recognition.
Battenberg Sudoku enriches the classic sudoku framework with fresh logical structures, making parity balance and local 2×2 interactions central to the solving experience.
Rules
Fill in the grid with digits from 1 to 9 putting one digit per a cell. Each row, column and outlined area should contain every digit exactly once. All places where a 2x2 square forms a Checkerboard pattern of Odd and Even digits are marked with Battenberg sign.
Click to see the answer.