Colour Sudoku Solver |
Solve Path now excludes unchecked strategies ↓
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Enter clues or solutions |
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Help on String Definitions used in this solver for transporting puzzles
Now updated and expanded! Puzzle Rules
Enter the numbers 1 to 9 uniquely in every row,
column, box and colour. Each colour is in the same position
relative to each 3x3 box.
Pick an example from the list and use [Take Step] to click through the steps of the solver so see how each puzzle solves.
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Note: All Chaining strategies now permit cycling alternatives, where found read more
Errors? [CRTL]+[F5] to clear and download the latest script files |
Colour Sudoku is the same puzzle as normal Sudoku with an extra constraint. In a similar way to the rows, columns an boxes, the colours must also be uniquely 1 to 9. Each colour is in the same position in each 3x3 box, as you will notice with the central white cell, for example. All Sudoku strategies continue to apply - except the ones that rely on the deadly pattern used by Uniqueness strategies.
The extra constraint does not add any extra complexity in the rows and columns - since a uniqueness constraint already exists, but it does effect cells diagonally. For example, B2, E5 and H8 are now connected and a conjugate pair may exist on those cells. So, like Sudoku X, the solver needs to be aware of all the new diagonal opportunities that are now possible.
Interestingly, this constraint forces the Sudoku puzzle to be 'perfect', that is, every number appears in a different position relative to each 3x3 box.
I have created enough test stock to grade this type of puzzle. However the Solution Count program also needs working on and I hope to make it available in the future.
All feedback, comments, arguments, bug reports and strategy ideas are welcome. There is a new FEEDBACK form with a column displaying comments and questions. Many thanks to all the people who have done so and helped improve this solver.
Use the "Import a Sudoku" button or type in a Sudoku puzzle in the small board.
You can also pick examples from the list above. Click on
Take Step to step through the solution.
Unknown squares are filled with 'candidates' - possible solutions.
Any cells that are reduced to one possible candidate are solved.
All Solutions to a Colour Sudoku | ||
By Andrew Stuart and Rui Gonçalves, Syndicated Puzzles |
Email your puzzle to a friend | ||
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. |