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Variant · Irregular regions

Jigsaw Sudoku — same digits, twisted boxes

Nine jigsaw-shaped regions replace the 3×3 boxes. Learn the rules and the scanning strategy, then sharpen the exact skills on a live board.

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Tap a cell, then a number

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Classic 9×9 practice board — row/column discipline is 80% of Jigsaw skill. Native Jigsaw mode is on our roadmap.

Jigsaw Sudoku rules

  1. Rows: each row contains 1–9 exactly once (same as classic).
  2. Columns: each column contains 1–9 exactly once (same as classic).
  3. Regions: each of the nine irregular regions contains 1–9 exactly once — the only change from classic.

The strategy that actually works

1. Trace before you solve. Spend the first minute outlining each region with your eyes. In classic Sudoku you know the boxes; in Jigsaw you don't — and every mistake starts with a region you misread. Strong Jigsaw players can point to all nine cells of any region from memory.

2. Hunt Hidden Singles first. Irregular shapes create more cells that are the only home for a digit inside their region. They are harder to see than in classic — which means your opponents miss them and you shouldn't.

3. Lean on rows and columns. They never changed. When region logic stalls, switch to pure row/column scanning — Hidden Single and Naked Pair do most of the work.

4. Adapt pointing to shapes. Pointing Pair logic survives, but 'the line inside the box' becomes 'the line crossing the region'. If a region confines a digit to one row, that digit leaves the rest of the row.

Why Jigsaw makes you better at classic

Jigsaw removes your autopilot. Players who solve two Jigsaw boards a week consistently report faster box-scanning when they return to classic — the skill of re-deriving region membership instead of assuming it is exactly what hard classic boards demand.

Keep exploring

All Sudoku variants · Diagonal Sudoku X · Killer Sudoku rules · Samurai Sudoku · Strategy ladder

FAQ

What is Jigsaw Sudoku?
Jigsaw Sudoku (also called Irregular or Chaos Sudoku) keeps the classic 9×9 grid and the digits 1–9, but replaces the nine square 3×3 boxes with nine irregular, jigsaw-shaped regions. Rows and columns work exactly as in classic Sudoku.
Is Jigsaw Sudoku harder than classic Sudoku?
At equal ratings, slightly — your classic box-scanning habits don't transfer directly, so early boards feel slower. The logic itself is identical; difficulty comes from re-learning where each region's cells are.
What is the best strategy for Jigsaw Sudoku?
Trace each region first and memorize its shape before placing anything. Then rely on Hidden Singles far more than in classic — irregular regions create more forced single-digit homes, and they are easier to miss visually.
Do classic techniques like X-Wing work in Jigsaw Sudoku?
Yes. Rows and columns are unchanged, so Naked/Hidden Singles, pairs, pointing logic adapted to regions, X-Wing and XY-Wing all still apply. Only box-based intuition needs rebuilding.
Where can I play Jigsaw Sudoku online?
A native Jigsaw mode is on the Zeloku roadmap. In the meantime, the fastest way to build the exact skills Jigsaw demands is daily classic practice — the Medium board on this page is ideal.

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