German Whispers
Adjacent digits on the green line must differ by at least 5
German Whispers is fully playable. Choose a difficulty and start solving.
Neighbouring cells on each green line must differ by 5 or more, which splits every line into alternating low (1–4) and high (6–9) cells — and bans 5 outright. Mark each line cell low or high and half the work is done. Distinctive, polarising, and great training for candidate discipline.
For the complete rules, worked examples and solving techniques, read the full How to Play German Whispers guide.
Like all Sudoku variants, German Whispers builds on the classic 9×9 foundation. Every row, column, and 3×3 box must contain each digit from 1 to 9 exactly once. The variant constraint is added on top of these standard rules, never replacing them.
If you're new to Sudoku, start by learning the basic rules and techniques before attempting variants.
Techniques Useful for This Variant
| Technique | How it applies |
|---|---|
| Pencil Marks / Notes | Essential for tracking candidates alongside the variant constraint |
| Obvious Singles | Cells narrowed to one candidate by the combined constraints |
| Hidden Singles | Digits with only one valid cell in a unit after variant elimination |
| Pairs and Triples | Locked candidates exposed by the additional constraint |