# Sudoku for Java - HoDoKu

## User Ratings

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ease 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
features 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5 4 / 5
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## User Reviews

• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

This algorithm can replace the techniques included in the fish strategies from the following chapters. Below are presented the few examples from the next 5 chapters. The other examples can be solve in the same way. For each candidate-digit will be determined the cells in which the candidate can take values. In this way we’ll obtain nine 9x9 matrix m1, m2, …m9 with n1, n2, ….n9 candidates with k1, k2, ….k9 lines, columns, blocks. The next step consist in calculus of numbers of possible cases N_i=C_(n_i)^(k_i ), i=1:9. For each case will be verify the accomplishing of bases conditions. If these conditions are not accomplished, from the unsolved cells, the candidate or candidates of those presence can introduce errors will be eliminated. Basic Fish JellyFish m7 – n7 = 29, k7=8 r2c2, r7c8, r8c8, r9c9, r7c9, r8c9 ><7 m9 - n9 =17 , k9= r2c2, r7c2, r1c9 ><9 Finned/Sashimi Fish 2.1 Finned/Sashimi Swordfish m2 - n2 =26, k2=7 r6c2><2 => r6c2=1 Solve r3c4><2 => r3c4=1 Solve r4c5><2 => r6c4=2 Solve r5c5 ><2 Complex Fish Siamese Fish m8, n8 =23 k8=6 r5c1 ><8 => r5c1=1 Solve r9c2><8 => r9c2=9 Solve Single Digit Pattern 4.1 Skyscrapen m4, n4 =13 k4=5 r2c1><4 => r2c1=6 Solve r1c4><4 => r1c4=6 Solve r5c5><4 => r5c6=6 Solve r2c6><4 => r1c6=6 Solve m6 n6 = 21 k6=6 r5c5><6 5.1 X Chain m7 n7=16 k7=5 r4c2><7 =>r4c2=4 Solve In order to keep the computing time in range of few seconds, n must be lower than 30. The program can solve all the examples from the “Fish strategies”.

Posted 02/28/2017
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There is room for improvement. One fundamental rule is to verify if the puzzle has multiple solution, It is not a Sudoku is it has multiple solution.

Posted 10/10/2016
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Great program with levels from very easy to insanely difficult. Unique feature is the 'Extended Print' I use this to print 2 puzzles per page. 5 pages at a time, then turn over the stack and print 2 per page on the other side. Select 'Extended Print' from file menu. select 2 per page in layout, then fill in each section eg number puzzles '2'; Difficulty 'Hard' then use slider on right to go to next section (5 sections in all) In 2 or 3 minutes with laser printer and I have 20 puzzles to take with me.

Posted 11/19/2015
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very good documentation, functional GUI

Posted 12/26/2014
• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

Nice one and very easy to use :) Thanks Michael

Posted 09/15/2012
• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

Previously played in the newspapers

Posted 04/20/2012
• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

Nice and Easy to use.

Posted 04/08/2012
• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

Amazing program to improve your Sudoku skills, support lots of techniques, is highly configurable. Maybe a bit too serious tough.

Posted 05/19/2011
• 1 of 5 2 of 5 3 of 5 4 of 5 5 of 5

THE best free Sudoku generator/solver!! Superbly well done. Everything I could wish for, including a highly configurable Solver allowing to focus on practising/learning specific techniques while excluding others. It can easily be set to allow the player to enter possible candidates in unsolved cells, instead of having the program automatically fill them in. Very neat feature, and way more fun, imho. Even though the Hint function is disabled in this situation, there are more than enough hints to be had via the Solution Path. Excellent program. For my purposes, I doubt there could be any better.

Posted 05/10/2011
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Getting back in to Sudoku after a 5 year hiatus. Discovered all my old sudoku software fell out of development. Found this application. Many new (to me) techniques implemented, and user feature customization. Well done!

Posted 03/07/2011
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The best free Sudoku puzzle generator and solver that is at the same time platform independent. Highly recxommended.

Posted 12/06/2009

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