If you are too rigid, this sudoku is impossible.
My solve of "Borromean Rings" by Allagem. A sudoku using the Killer, Parity Line, German Whisper and Sum Line constraints.
Solve in Sven's SudokuPad WebApp: https://tinyurl.com/SudokuPad-NewBorromeanRings
📋 Puzzle Rules:
• Normal Sudoku rules apply.
• Digits in cages sum to the clue in the corner of the cage.
• The red ring is a Parity line - adjacent digits on the red ring have different parity (odd/even).
• The green ring is a German Whisper line - adjacent digits on the green ring differ by at least 5.
• The blue ring is a Region Sum line - digits on the blue ring sum to the same value in each region the ring passes through.
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