Daily Jigsaw Sudoku (SudokuWiki)

About Daily Jigsaw Sudoku (SudokuWiki)

SudokuWiki.org is a well-known reference for sudoku solving techniques, built by Andrew Stuart around his online solvers. Besides its strategy articles it runs a set of daily puzzles, and the Daily Jigsaw Sudoku is one of them. Each puzzle carries a running number, past 6,400 by October 2026, and the same puzzle is shown to everyone on a given day.

A jigsaw sudoku, also called irregular sudoku, keeps the familiar rules: every row and column must contain the digits 1 to 9 once. The difference is that the nine 3x3 boxes are replaced by nine irregular shapes, shown in different colours, and each shape must also hold 1 to 9 once. This changes which deductions work and makes some familiar box tricks unavailable.

The on-page player accepts keyboard input or a number pad on phones, has settings behind a cog icon, keeps the timer across refreshes, and offers a print version. The free daily is one grade; All-Access supporters can play all four grades. The site's jigsaw solver can help if you want to learn the logic behind a step.

It suits sudoku players who want a regular variant and who like to learn the reasoning behind each step.

How to play Daily Jigsaw Sudoku (SudokuWiki)

1. Open The Daily Jigsaw Sudoku on SudokuWiki.
2. Fill the grid so every row and every column contains 1 to 9 once.
3. Make sure each coloured irregular region also contains 1 to 9 once.
4. Type numbers into cells, or switch to the number pad on a phone.
5. Finish the grid, or print it to solve on paper.

Tips

• Regions that bulge into a row or column often fix where a digit must go, look at the cells inside versus outside a row.
• Use the law of leftovers: the cells a group of regions pushes outside a set of rows must match the cells pulled in.
• Read the SudokuWiki strategy pages if you get stuck, they explain each technique.

Questions