German Whispers: rules, strategy and how to start
Adjacent digits on a whisper line differ by at least five. The result is a corridor where low digits and high digits alternate, and the middle values 4, 5 and 6 can barely appear at all.
Why the rule changes everything
A digit in the middle of a whisper has two neighbours, and it must be far from both. That squeezes 4, 5 and 6 out of the interior of any line longer than three cells — they have too few partners at distance five.
Whisper lines also interact with the grid: a 3 near the edge of a line tells you the next cell is 8 or 9, which usually resolves within a few steps.
How to start a board
- Mark every cell of a whisper line with the digits it could hold given its neighbours on the line.
- Cells at the end of a line are free on one side — start there.
- Hunt for a 1 or a 9 in the grid that touches a whisper; their partner must be 6+ or 4− respectively.
Common mistakes
- Applying the difference rule to cells that are adjacent in the grid but not on the line.
- Forgetting the rule is ≥ 5, not > 5 — a difference of exactly five is legal.
- Assuming whispers must alternate high/low strictly; 2→8→3 is fine, 2→8→7 is not.
Frequently asked questions
Why is it called German whispers?
It comes from the German puzzle championship where the rule was popularised; the original name is “Deutsche Flüsterer”.
Can a whisper line contain a 5?
Only at an end, next to a digit ≤ 0 or ≥ 10 — which do not exist. So no: 5 cannot appear on a whisper line at all.
Every board on this site is generated with a uniqueness check, so the puzzle in front of you has exactly one solution and every digit can be proved rather than guessed.
Play German Whispers ↗