What is Jigsaw Sudoku?

Jigsaw Sudoku is a Sudoku variant where the usual 3x3 boxes are replaced by irregular jigsaw-shaped regions. It is also known as Irregular Sudoku or Squiggly Sudoku. The core rules stay familiar: fill the 9x9 grid so every row, every column, and every colored region contains 1-9 with no repeats.

That one change makes the puzzle feel fresh. Classic box patterns no longer work automatically, so each board asks you to read the region shapes and find new constraints.

Jigsaw Sudoku rules

Each row contains 1-9 with no repeats.
Each column contains 1-9 with no repeats.
Each colored jigsaw region contains 1-9 with no repeats.

Pick a cell, then enter a number from 1-9 with your keyboard or the on-screen pad. Given clues are fixed, and any conflict is highlighted in red so you can fix it right away.

Jigsaw Sudoku tips

Start by scanning one row, one column, or one jigsaw region for a digit that has only one possible place left. Irregular regions often squeeze several cells into a narrow band, and those tight bands are usually the fastest place to make progress.

When you get stuck, compare a colored region with the rows and columns that cut through it. A region may look unusual, but it still needs every number from 1-9 exactly once.

Jigsaw Sudoku vs classic Sudoku

Classic Sudoku lets you rely on the same nine 3x3 boxes every time. Jigsaw Sudoku changes the shape of those boxes, so the puzzle is less pattern-based and more spatial. If regular Sudoku feels too predictable, irregular Sudoku is a good next step without learning a completely new rule set.