Medium German Whispers Sudoku

Adjacent digits on green lines must differ by at least 5. The high–low alternation this forces shapes the entire solve.

Easy Medium Hard Expert

German Whispers Sudoku at medium difficulty. Longer lines and intersections require tracing the high/low alternation across multiple boxes.

4
9
5
7
7
3
6
4
1
1
2
4
3
8
3
9
1
2
5
6
5
1
4
3
9
7
4
6
1
6
7
3
Mistakes
0/3
Score
-
Time
00:00
Try Hard German Whispers →
Progress0%

What is German Whispers?

Difficulty
★★★★☆
4/5
Constraint Type
Line Constraints
Typical Givens
18–26
Avg. Solve (Medium)
22 min

Solving Techniques for Medium Level

Technique Description Level
High-Low Alternation Adjacent cells on the line must differ by ≥ 5. This forces a strict alternating high-low pattern: low (1–4) alternates with high (6–9). Beginner
Digit 5 Exclusion 5 cannot appear on any German Whispers line — no digit within 1–9 differs from 5 by at least 5. Eliminate 5 from all line cells immediately. Beginner
Low-Set {1,2,3,4} / High-Set {6,7,8,9} Every whisper cell belongs to one of these two sets. Apply row/column/box constraints within each set to narrow candidates. Intermediate

Master these, then take on Hard German Whispers to learn Advanced techniques.

Techniques to Master at Medium

  • Hidden Singles technique — Since 5 is banned from every green line, it must squeeze into the few off-line cells of each crossing row and box — whisper grids hand you 5's hidden singles for free.
  • Obvious Pairs technique — Cells flanking a 3 on the line can only hold 8 or 9 — when both flanks share a unit they form an instant {8,9} pair that strips those digits from the rest of it.

Average Solve Time by Difficulty

Easy
10 min
Medium
22 min
Hard
44 min
Expert
74 min
Want a full walkthrough of rules, strategies, and solving steps? How to Play German Whispers →

Related Variants

Renban Sudoku

Both are coloured-line constraints — whispers force big jumps between neighbours while renban forces a tight consecutive set.

Between Lines Sudoku

Another line variant about value ranges: every line digit must fall strictly between the two circled endpoints.

Thermo Sudoku

If you like how whisper lines polarise digits into highs and lows, thermometers impose a full ordering along the line.

Frequently Asked Questions — Medium German Whispers Sudoku

What solving techniques are needed for medium German Whispers Sudoku?
Medium puzzles require applying the high/low alternation rule across longer whisper lines, combining that with standard Sudoku naked singles and hidden singles. Look for cells where the whisper constraint leaves only one or two valid digits, then cross-reference with row, column, and box constraints to resolve exact values.
How do whisper lines that cross multiple boxes help at medium level?
A long whisper line passing through several boxes creates a chain of high-low constraints that links those boxes together. Resolving the group (high or low) of even one cell on the line forces the group of every alternate cell throughout the entire line. This often eliminates four or five candidates from cells in boxes that would otherwise seem independent.
What happens when two whisper lines intersect at the same cell?
The shared cell must satisfy the difference-of-5 rule with its neighbors on both lines simultaneously. This double constraint usually reduces the valid digit range to just two or three options. Cells at whisper-line intersections are among the most powerful deduction points in medium and harder puzzles.
Can the digit 5 appear anywhere in German Whispers Sudoku?
Yes — the digit 5 can appear in cells that are not on any whisper line. The restriction only applies to cells touched by a green line. In medium puzzles, the combination of 5 being forced into off-line cells and the high/low alternation on-line often pins down which box regions must hold the 5 in each row and column.
How long does a medium German Whispers Sudoku take?
Most players finish a medium German Whispers puzzle in 15 to 25 minutes. The high/low alternation is fast to apply once understood. Getting stuck usually means forgetting to propagate the alternation through an entire long line before switching to standard Sudoku techniques.

More questions? See the full German Whispers Sudoku guide.