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Killer Sudoku Solver Please report any bugs. Tested in IE and Firefox.
 Feedback: Form and User Comments/Questions Here
 
Click to edit candidates or enter a solution:

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Pick an example here


Quick help: Using this Solver

You can 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.

You can enter a new Killer puzzle using the new 'designer' - click on "Enter new Killer". Once you fill in the clues and set up the cages correctly it can be solved.

Unlike the other solvers you can only edit the main board when solving. The small board only displays the clues.
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Version 1.93
See Strategy Overview documentation

Coordinate system: Letter/Number rYcX

 
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Show Candidates
Check for Solved Squares   
Show Possibles  
1: Hidden Singles  
3: Naked Pairs/Triples  
4: Hidden Pairs/Triples 
5: Naked Quads 
6: Killer Combinations (easy)  
7: Innies and Outies (1 cell)  
8: Pointing Pairs  
9: Box/Line Reduction  
10: Cage Splitting  
Tough Strategies
11: X-Wing  
12: Simple Colouring  
13: Y-Wing  
14: Innies (2 to 4 cells)  
15: Killer Combo's (hard)  
16: Cage/Unit Overlap  
17: Cage Compare  
18: Sword-Fish  
Diabolical Strategies
19: X-Cycles  
20: XY-Chain  
21: 3D Medusa  
22: Jelly-Fish  
23: XYZ Wing / WXYZ Wing  
24: Aligned Pair Exclusion  
Extreme Strategies
25: Grouped X-Cycles  
26: Finned X-Wing  
27: Finned Sword-Fish  
28: Altern. Inference Chains 
29: Sue-de-Coq  
30: Digit Forcing Chains  
31: Nishio Forcing Chains 
32: Cell Forcing Chains  
33: Unit Forcing Chains  
34: Almost Locked Sets  
35: Death Blossom  
36: Pattern Overlay Method  
37: Quad Forcing Chains  
"Trial and Error" 
36: Bowman Bingo 


Please report any bugs - Thanks.

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Welcome to this new Killer Solver

I have been solving and making Killer Sudoku puzzles since 2005 and although my Sudoku solver has been part of this site since those early days I have not attempted a public solver until now. The main reason I have shied away from attempting it was the complexity of the puzzle in terms of the user interface. However, I hope I have now come up with a satisfactory solution. The independent 'Designer' handles the entering of the clues and cages. Keeping this separate and being able to (loosely) validate the entry should allow puzzle solvers a fairly quick way of setting up the puzzle for solving. I hope you agree and I'd love to hear your feedback.



You should also be aware of the Killer Cage Convention.

New in version 1.91 (October 16th 2012)
Re-wrote the Innies/Outies algorithm to look for innies with more than one cell covering several sticking-out cages. Re-ordered the strategies to balance them against new calibrations.
Added Cage Comparison to the killer strategies.

New in version 1.74 (June 21st 2011)
I sped up the "Take Step" process by skipping failed strategies and going straight to the first successful one. This applies to the basic strategies which are client-side. If you get "script taking too long" messages from your browser, let me know. It's a bit risky for slower machines and I'd like to find out if this works for everyone.
New in version 1.67 (January 24th 2011)
Added an Email button to ease transfering a Killer definition and loading it into the solver.

New: Version 1.02 (June 13th 2009)
Killer Sudoku Solver released

Still to do:
  1. Some kind of emailing and importing using only a single string. Unfortunately the information required to transport a Killer using a web address is a little too large. The puzzle requires the clues, the cages and the state of the board during play. So I haven't thought of an easy method to provide those features.
  2. I will be adding a Solution Count soon.
  3. Much of the Killer strategy text that is displayed in the result panel is a little too obscure. I will be making more friendly versions in the next upgrade.


Solver created on 30-May-2009.

This page was last modified on 17-July-2012.
All code and design is copyright and for personal use only and may not be reproduced elsewhere.
Copyright Andrew Stuart @ Syndicated Puzzles Inc, 2005-2012