Sandwich Sudoku

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Misstag
0/3
Poäng
-
Tid
00:00
Nytt spel
Framsteg0%
Lätt · Sandwich Sudoku Byt svårighetsgrad ovan ↑
Hur man spelar Sandwich Sudoku
Standard Sudoku-regler gäller. De blå siffrorna till vänster anger summan av siffror som är inklämda mellan 1 och 9 i den raden. De blå siffrorna upptill anger samma sak för varje kolumn.
Fullständig guide →

Ledtrådar ger summan av siffror mellan 1 och 9 i varje rad/kolumn

Vad är Sandwich Sudoku?

Sandwich Sudoku placerar ledtrådar längs utsidan av rutnätet. Varje ledtråd anger summan av alla siffror som kläms mellan 1 och 9 i den raden eller kolumnen. Positionerna för 1 och 9 varierar, så 'sandwichen' kan ha 0 till 7 celler beroende på var de hamnar. En ledtråd på 0 betyder att 1 och 9 är intill varandra. En ledtråd på 35 betyder att alla siffror 2–8 är mellan dem.

Översikt

BegränsningstypUtanför-ledtrådar
Typiska givna4–10 clue values
Svårighetsbetyg ★★★★☆ 4/5
Genomsnittlig lösningstid — Lätt12 min
Genomsnittlig lösningstid — Medel26 min
Genomsnittlig lösningstid — Svår52 min
Genomsnittlig lösningstid — Expert85 min

Hur man löser Sandwich Sudoku

TeknikVad den görNivå
Clue 0 Means Adjacent 1 and 9 A sandwich clue of 0 means 1 and 9 are side-by-side with nothing between them. Place this pair immediately. Avancerad
Clue 35 Means 1 and 9 at Ends A clue of 35 = 2+3+4+5+6+7+8. All middle digits are sandwiched, placing 1 and 9 at the two ends of the row/column. Avancerad
Position Enumeration For each clue, enumerate all valid positions of 1 and 9 such that the enclosed digits sum to the clue. Cross-reference with column clues. Avancerad
Sandwich Intersection Row and column clues intersect at one cell. Combining row positions of 1 and 9 with column positions pinpoints key placements. Avancerad
Digit Forcing from Both Sides Use clues from both the row and column sides to triangulate the positions of 1 and 9 simultaneously. Avancerad

Genomsnittliga lösningstider

Lätt
12 min
Medel
26 min
Svår
52 min
Expert
85 min

Daglig Sandwich Sudoku

Vill du ha ett färskt sandwich-pussel varje dag? Ett nytt pussel genereras vid varje besök på varje svårighetsgrad, så du kan göra Sandwich Sudoku till en del av din dagliga rutin — spela ett lätt uppvärmning med ditt morgonkaffe eller ta dig an en expert-rutnät när du har tid att tänka. För ett gemensamt dagligt pussel med globala rankningar, prova Daglig Sudoku-utmaning, där varje spelare löser samma plan och tider jämförs på topplistan.

Vanliga frågor

Vad är Sandwich Sudoku?
Sandwich Sudoku is a variant where clue numbers appear outside the grid, one per row and one per column. Each clue tells you the sum of all digits that appear between the 1 and the 9 in that row or column. Standard Sudoku rules apply throughout.
How do I use the sandwich clues?
First, find the positions of the 1 and 9 in each row or column — every other digit between them must sum to the outside clue. A clue of 0 means the 1 and 9 are adjacent. A clue equal to the maximum possible sum (e.g., 35 for a 7-cell sandwich) tells you the 1 and 9 are at the ends. Work from the most constrained clues first.
Vad betyder en sandwich-ledtråd på 0?
A clue of 0 means no digits are sandwiched between the 1 and 9 — they must be directly adjacent to each other. This is one of the most powerful clues because it immediately tells you where 1 and 9 can and cannot be placed relative to each other in that row or column.
Is Sandwich Sudoku harder than regular Sudoku?
Yes, generally. Sandwich Sudoku provides very few pre-filled digits inside the grid. Almost all deductions flow from working out where 1 and 9 can sit and what sums are achievable. The logic is more algebraic than classic Sudoku, which many players find both more challenging and more satisfying.
Can the 1 and 9 be at the ends of a row?
Yes. If the 1 is in column 1 and the 9 is in column 9 (or vice versa), the sandwiched digits are columns 2–8, giving a maximum possible sum of 2+3+4+5+6+7+8 = 35. Extreme clue values like this immediately fix the positions of both the 1 and the 9.
How long does Sandwich Sudoku take to solve?
Easy puzzles typically take 10–20 minutes. Medium puzzles run 20–35 minutes. Hard puzzles can take 45–75 minutes, and expert puzzles often exceed 90 minutes. The key bottleneck is working out 1/9 positions — once you pin those down, the rest of the grid often resolves quickly.
Prova även
Killer Sudoku
Both are sum-deduction puzzles at heart — killer's 45 rule and sandwich's crust sums exercise the same arithmetic.
Skyscraper Sudoku
Outside clues again, but read as building visibility instead of sums — the same edge-of-grid deduction style.
Utanför Sudoku
The gentlest outside-clue cousin: border digits simply belong in the nearest three cells, no arithmetic required.
Daglig utmaning