Jigsaw Sudoku — Irregular Region Sudoku Rules, Strategy and Daily Puzzles
Jigsaw sudoku throws away the 3×3 boxes and gives you nine irregular regions instead — polyominoes of nine cells each that snake across the grid like pieces of a jigsaw. The rest of sudoku survives untouched: every row, every column and every region must contain the digits 1 through 9 exactly once. That single change is enough to make a familiar puzzle feel brand new, because the box patterns you have memorised stop working and you have to read the shape of the grid all over again. This page hosts a free jigsaw sudoku game with one date-seeded daily board shared by every player, unlimited Easy, Medium and Hard grids, printable output, and a full tactic guide for irregular regions.
Jigsaw Sudoku Rules
- Rows and columns: each of the nine rows and nine columns holds 1–9 exactly once — identical to plain sudoku.
- Regions: the nine coloured jigsaw shapes each hold 1–9 exactly once. Every region is exactly nine cells, and they tile the grid without gaps or overlaps.
- Givens: the bold digits are fixed clues.
- Unique solution: every board here is generated, then verified with a solver to have exactly one solution.
Because a jigsaw region can cross three or four different rows and columns, a single placement constrains a whole diagonal band of the grid instead of one neat 3×3 box. Read the colours before you read the digits — that habit alone will save you a lot of backtracking.
Five Jigsaw Sudoku Strategies
- Read regions first. On ordinary sudoku you can start with any row or box. Here, trace each coloured shape once before you place anything. Knowing which cells belong together is the whole difficulty of the variant.
- Use row and column hidden singles. Regions are unreliable anchors, but rows and columns never change. Sweep one digit at a time across a row: if a 7 can only sit in one cell of that row, it is a 7 — regardless of what the regions look like.
- Look for region "spikes". When a region sends a single cell into a row, that cell is the only place the region can use one of its digits, which often produces an immediate hidden single inside the row.
- Adapt pointing and claiming. The classic box-line reduction still exists, but it now says: if all the candidates for a digit inside a region lie in one row, remove that digit from the rest of the row. Learn the region-shaped version of the rule and hard grids open up.
- Keep pencil marks complete. Jigsaw grids punish partial candidate lists more than boxes do, because a region can hide a constraint behind an unfamiliar shape. Mark every empty cell, then eliminate.
Difficulty Levels
- Easy: around 44 givens and blobby regions. Ten to fifteen minutes, mostly naked and hidden singles.
- Medium: around 36 givens, the daily default. Needs full pencil marks and locked candidates.
- Hard: around 30 givens with thinner, more sprawling regions. Expect pointing and claiming plus longer elimination chains.
Printable Jigsaw Sudoku
Switch to Unlimited, press New Puzzle until you like the shape layout, then print the page with your browser's print command. The colours become greys on a monochrome printer but the heavy region outlines remain, so the printed grid is every bit as playable. That makes this page a printable jigsaw sudoku source you can refill as often as you like, at no cost and with no sign-up.
If you would rather have a machine do the work on a specific grid, the Sudoku solver handles ordinary 9×9 layouts; for jigsaw constraint work the three in-game hints are usually enough to restart your own logic.
Daily Puzzle, Streaks and the Leaderboard
The Daily board is generated from a date-seeded deterministic generator, so every player on the same date gets identical regions and identical givens — no refreshing for a friendlier layout. Solve it and your time lands on the shared daily leaderboard Top 50, with a 🔥 streak for consecutive days. Generation and uniqueness verification both happen in your browser, in milliseconds.
Prefer a different grid? Classic Sudoku for 3×3 boxes, Killer Sudoku for cages and sums, Sandwich Sudoku for outside-the-grid clues, and Mini Sudoku for 5×5, 6×6 and 8×8 boards. More number-grid logic lives on the number games and logic puzzles hubs, alongside Nonogram and Minesweeper.
Why Jigsaw Sudoku Is Worth Your Time
If classic sudoku has become automatic — you scan, place, scan, place without really thinking — jigsaw sudoku is the reset button. It strips the pattern memory you have built and forces genuine reading, which is exactly the workout that keeps a puzzle game useful for years. The grid is still completely logical: no guessing, no arithmetic, no hidden information. Just nine rows, nine columns, nine irregular regions, and one answer.