36x36 sudoku

accept. The question interesting, too..

# 36x36 sudoku

Return to Sudoku variants. Re: giant sudoku's 16x16, 25x25, 36x I could not resist trying to solve this puzzle with my program. The general SAT-solver needed 0. Code: Select all. Generation of x took 15 min though I did not try any optimization yet.

### Sudoku 36×36

For x though I do not think it will finish in a reasonable time yet. The algorithm yet is extremely simple: 1. Fill all rows with numbers from N in random order. Select a random row r and in this row two random cells r,c1 and r,c2. Count the number n1 of "wrong" numbers in the two columns c1 and c2 and in the two blocks b1 and b2 the r,c1 and r,c2 are in. Swap the content of r,c1 and r,c2. Count again. If the number n2 of "wrong" numbers is now greater, swap back. Goto 2 and repeat until the grid is valid.

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Surprisingly the algorithm does not seem to get stuck in a local minimum most of the time? For a standard 9x9 creation time is only about 30 ms on average, for a 49x49 20 s to 30 s.

For x-sudokus my method works only for 9x9 and 16x For larger sizes I offer a solver a pseudo puzzle, empty but with the diagonals already in place, and take the first solution it finds. That works for up to 36x I'll look at the 16x16 problem very soon. For XSudoku mine does not seem to work at all.Ponadto na stronie Sudoku. By using our website, you agree to the use of cookies to personalize content and ads, to analyse our traffic and for the performance of our website.

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Three Diabolical Sudoku Techniques

Regards, Mike Metcalf. Probably of no interest to anyone, but this is much harder SE would be 7 to 8.

The first puzzle has now variables and clauses and is solved in 0. The second puzzle has variables and clauses and is solved in 0.

Btw is there any test suite with puzzles to measure the speed of a SAT solver? Mine is restricted to boards up to 64x64 in the moment. The correspondig bord size then is NxM x MxN. I would prefer "hard" puzzles. Now the puzzle is really hard for my SAT-solver and it takes about 20 minutes to solve it. I wonder how other solvers handle this. I try to reduce it further but the time seems to increase exponentially with each new reduction - greetings to the NP-completeness of the SAT problem.

We could also include reflection at the diagonals such there is an 8-fold symmetry of the given-positions. I got it from reducing the solution of the puzzle. It takes me 20 s to solve. My own modest program all my own work does not have any general brute force or other method available for massive puzzles, once logic methods are exhausted.

I did look into using a stochastic solver that I wrote 12! However, in reading this old code, I found an improvement that enables it, for the first time, to produce random 16x16 X-sudoku grids from scratch not that anyone is really interested anymoreso that was worthwhile.

It would be interesting if you could post, in line format, a dozen or so each of some standard 9x9 and X-sudoku 9x9 hard puzzles that you've generated. Board index All times are UTC.Javascript is disabled in your browser. This website requires Javascript to work properly. This page is best viewed in landscape orientation on your tablet. Sudoku Solver. Naked Subsets. Hidden Subsets.

Enter the numbers of the puzzle you want to solve in the grid.

You can solve the puzzle completely, partially or solve a single cell using the buttons in the Solving section of the Features block. The solver provides several analysis features which allow you to check if a puzzle is valid, rate the difficulty of a puzzle or get hints on how to solve a puzzle step by step. Thousands of free puzzles in varying grades of difficulty are available. Just click on the relevant sample button on the right hand side to load a puzzle of that difficulty to the grid.

Comments and suggestions to support sudoku-solutions. If you have a question you may find it already answered in one of the most frequently asked questions below:. When a hint is requested, the solver uses a set of solving techniques to find the next step to solve the puzzle.

For most puzzles a hint can be provided, however for some extremely difficult puzzles the solver will not be able to provide a hint and will return the message "No Hints Available".

This does not mean that the puzzle cannot be solved logically, it means that the limitations of the solver have been reached. The solver returns this message when there is no solution for a puzzle.

This can be due to an incorrectly specified cell value or an invalid candidate. Please recheck your input, clear your candidates and retry.A variant of Sudoku is the alphadoku puzzle comprised of 25 squares by 25 squares. In this type of puzzle the letters A to Y of the alphabet are used. There are grids to choose from. There are two types of puzzles with three skill levels for each grid type.

Grid Types: A symmetrical or Symmetrical. There is only one solution possible per puzzle. Neither hypothetical theories nor multiple choices are needed to find the solution. You can save games in progress and reload them later. We suggest using Google Chrome. Indeed its execution speed is very valuable in the display of the cells of this type of grid and the online help. Choosing alphadoku puzzles: These puzzles have been produced and ranked in such a manner so that the higher the puzzle number of a specific level, the more difficult the solution is.

When solving either the symmetrical or asymmetrical alphadokus, the difficulty is roughly equivalent between the corresponding puzzle numbers of the two types within a certain skill level. The symmetrical puzzles are slightly easier to solve.

The fact that symmetrical puzzles are, in fact, symmetrical they already have an extra constraint and thus there are fewer empty squares. Please note that the degree of puzzle difficulty can vary from person to person. Difficulty is a subjective concept and each player solves puzzles different ways using different methods with which he or she feels at ease.

Alphadoku puzzles: These puzzles are a variation to standard Sudoku puzzles. They enable seasoned players to find additional difficulty. The alphadoku 25X 25 square puzzles also serve as practice for experienced competitors and the habitual fans of the original Sudoku 9X9 puzzle. Refer to How to solve for further information regarding these three solution methods, identical to those used for Sudoku 9X9 puzzles. Like Sudoku puzzles, alphadoku puzzles are symmetrical when the squares of which they are composed are equally arranged around the central square.

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The central square is also considered the center of symmetry and has only an esthetic value. Nothing is changed as far as what method is used for solving the puzzle. On the other hand, the benefit of non-symmetrical puzzles is that they allow for increased puzzle complexity with more difficulty since they have one less constraint.

All these Alphadoku - 25 x 25 puzzles - of this site are created by sudoku-puzzles-online.

Alphadoku - 25x25 sudoku puzzles to play online 60, 25x25 sudoku grids to choose from. JavaScript appears to be disabled. To play our alphadoku grids, please enable JavaScript by changing your browser options, then try again. Enter a puzzle. Play puzzles online.Giant Sudoku puzzles are one of those things that divide people.

If so, let me know! Wow, it is a long time since I posted here. So much to do, so little time! I might as well keep it brief now, then.

The puzzle combines regular Sudoku with Jigsaw Sudoku. A brand new book, packed with Jumbo 3D Sudoku, is now available for purchase from Amazon. You can either search for this directly, or you can click through via my PuzzleBooks. Just place 1 to 9 once each in every row, column and bold-lined box. Sudoku Xtra 24 is now finally available! Sudoku Christmas Star puzzleA Sudoku, in a star shape.

The advantages provided by English as a global languageThis is one more IELTS Writing task Essay Evaluation question with a model answer attached to it. Some universities now offer their courses on the Internet so that people can study online. Is this a positive or negative development. One thing to notice hereIn the IELTS listening exam, you can find completion type of questions in the last section i. In these questions, you find a list of statements with blanks to be filled after listening to audio conversation.

The questionIn IELTS Listening test, one of the easy questions is of diagram type that is quite common in Section 2. In such questions, you are given a diagram which can of any equipment, instrument, gadget, manufacturing process or anything whichYou may come across flow chart type of questions in IELTS listening exam, probably in Section 2.

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This is another form of diagram questions where you need to fill the flow chart by listening to the audio. Flow chart isOne of the tricky questions apart from multiple choice questions in IELTS listening are the matching heading type of questions. As it can be determined by the term itself, matching heading involves matching a list of questions to another listIELTS listening section 1 is perhaps the easiest part of IELTS listening exam. The reason is that you have simple questions of form filling or short notes type.

If you can get all the ten questions right in this section, it wouldDid you notice a spelling error in this article title. Yes, you are right. It should be written as IELTS Listening, not ILETS Listening. The reason why this spelling error is highlighted in the title is to draw your attention towards the wordSince Indian students are writing and speaking in English with Indian accent, with not much exposure to foreign accent, it can be the cause of some penalties they may face in IELTS listening module.

Let us know what these likelyIn the previous article, we discussed how to crack IELTS Listening Section 3. In this article, we will look at the next section in IELTS Listening test i. In this section, almost all the times, you find sentenceIELTS Listening module consists of 4 sections viz.

## Sudoku Solver

Section 1, Section 2, Section 3 and Section 4. Out of all these sections, Section 3 is the part where you listen to audio conversation of up to 4 people. This is perhapsSection 2 is one of the easy parts in IELTS listening exam because in this section, you hear an audio which is a monologue where only one speaker is there to talk about every day social situation.