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SudokuWiki.org
Strategies for Popular Number Puzzles
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SudokuWiki.org
Strategies for Popular Number Puzzles
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| Jigsaw Sudoku Solver |
Solve Path now excludes unchecked strategies ↓
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| Enter clues or solutions |
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New: Custom jigsaw shapes can now be set up. Read the help page
Quick help: The differences
Jigsaw Sudokus are the same as normal sudoku except for the shapes of the boxes. Some strategies cannot be used (see below) but there are important new ones such as the Law of Leftovers. In order to use this solver you need to pick the correct grid shape from the list above or create a custom shape map. Only then type the numbers into the small grid, use the Import button or pick an example from the example list. 
Errors? [CRTL]+[F5] to clear and download the latest script files
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Welcome to my Jigsaw Sudoku pageIn many ways Jigsaw's are even more interesting than normal Sudokus, although they have not been studied as much. All bar a few of the classic Sudoku strategies pertain to Jigsaws, but in the current version I have removed Uniqueness tests since it is very difficult to determine valid 'Deadly Rectangle' in the jumble of shapes. However the non square shapes open up the opportunity to use some neat strategies only found in Jigsaws such as the Law of Leftovers, Double Pointing Pairs and Double Line/Box Reduction. Also puzzles are often defeated using simple Pointing Pairs and Box/Line Removal as the shapes of the boxes lead to more opportunities for these strategies. I have now added a page showing all the Jigsaw Shapes All feedback, comments, arguments, bug reports and strategy ideas are welcome. There is a FEEDBACK form with a column displaying comments and questions. Many thanks to all the people who have done so and helped improve this solver. New in version 2.20 (19th June 2024) Custom Jigsaw Shapes! Choose [Enter New Jigsaw] and set up a Jigsaw you found in the wild. New in version 2.14 - 2.16 (May 2024) New and much faster Solution Count. New Solution Count and Email popups. Packed strings for transporting candidates allowed on url and import Added candidate chaining and colouring. Added some new 'shape' patterns - see the end of the example pull down list. These are used in the new Jigsaw Sudoku Puzzle Packs. The examples here are gentle, moderate, tough and extreme - four each for each new shape pattern. Version history here New in version 1.38 (November 21st 2006) Release of the Jigsaw Solver |
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| All Solutions to a Jigsaw Sudoku | ||
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| By Andrew Stuart and Rui Gonçalves, Syndicated Puzzles | ||
| Email your puzzle to a friend | ||
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Copy and paste the contents of the green box into your email program and send it off. The links contain the puzzle which will load when your friend visits the Sudoku Solver. |
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You can create a custom shape and it will be stored as a cookie.
Choose colours in the top row and click on cells on the board.
Your Jigsaw is ready when all colours have nine cells
To use more than one custom shape load them from the parameter line. Look at the format in [Email This Board] and substitute your 81 character custom map for the shape number.