Hoe Sukaku te spelen

Een potloodaantekening-stijl variant waarbij aanwijzingen worden gegeven als kandidaatsets

Speel Sukaku Gratis → Sukaku Puzzels

De Regels

Standaard Sudoku-regels zijn van toepassing: vul elke rij, kolom en 3×3 blok met de cijfers 1–9, elk precies één keer.

Sukaku (数角) is een Sudoku-variant waarbij in plaats van gegeven cijfers elke cel een set mogelijke kandidaten krijgt. De oplosser moet kandidaten elimineren met behulp van standaard Sudoku-logica totdat elke cel precies één overgebleven kandidaat heeft. Sommige Sukaku-puzzels bieden zeer schaarse kandidaatsets (bijna volledige gegeven cijfers), terwijl andere volledige of bijna volledige kandidaatlijsten bieden, waarvoor geavanceerde technieken nodig zijn om op te lossen.

Voor waar deze puzzel vandaan komt, hoe het zich verhoudt tot gerelateerde varianten en een strategieoverzicht, zie onze Sukaku variantoverzicht.

In één oogopslag

All candidates shown
Typische gegeven cijfers
Pencilmark Elimination
Beperkingstype
~8m
Gemakkelijk oplostijd
~18m
Gemiddeld oplostijd

Hoe Sukaku op te lossen

Beginner
Candidate Scanning
Start by scanning rows, columns, and boxes — any candidate appearing in only one cell in a group must be placed there.
Beginner
Cross-Hatch Elimination
When a digit is placed (or reduced to one candidate), eliminate it from all cells in the same row, column, and box.
Gemiddeld
Naakte Enkelingen
A cell with only one remaining candidate is a naked single — the digit is forced. In Sukaku, this happens automatically when you eliminate down to one candidate.
Gemiddeld
Verborgen enkelingen
A candidate that appears exactly once in a row, column, or box must be placed in that cell regardless of how many other candidates that cell shows.
Gevorderd
Pair Elimination
Two cells in a group that share only the same two candidates form a naked pair — both candidates can be eliminated from all other cells in that group.
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Veelgestelde Vragen

What is Sukaku? ▾

Sukaku is a Sudoku variant where every cell in the 9×9 grid starts pre-filled with a set of pencilmark candidates instead of given digits. Your task is to eliminate incorrect candidates using standard Sudoku rules until exactly one digit remains in each cell. All 81 cells begin with multiple possibilities.

Hoe verschilt Sukaku van gewone Sudoku? ▾

In classic Sudoku, some cells are pre-filled with confirmed digits. In Sukaku, no cell has a confirmed digit — instead, each cell shows a subset of possible digits as pencilmarks. The starting pencilmarks are curated by the puzzle constructor and are always consistent with the unique solution.

Are the starting pencilmarks always correct? ▾

Yes. The pencilmarks shown at the start of a Sukaku puzzle represent a valid subset of candidates for each cell — they are never wrong, but they may include more candidates than strictly necessary. Your job is to eliminate all but the correct digit using logical deductions.

What techniques work best in Sukaku? ▾

All standard Sudoku elimination techniques apply: naked singles (when only one candidate remains in a cell), hidden singles (when a digit can only go in one cell within a row, column, or box), naked pairs, pointing pairs, and advanced techniques like X-Wings and Swordfish. The absence of given digits means you rely entirely on elimination.

Is Sukaku harder than regular Sudoku? ▾

Easy Sukaku is more forgiving than classic Sudoku because the pencilmarks are already provided — you never have to work out candidates from scratch. Hard and expert Sukaku puzzles with minimal starting candidates require the same advanced techniques as difficult classic Sudoku.

How long does Sukaku take to solve? ▾

Easy puzzles take 5–15 minutes. Medium puzzles run 15–30 minutes. Hard puzzles average 30–60 minutes and expert puzzles can take over 90 minutes. Solve time scales with how many eliminations each technique step provides.

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