- ation in combination with column and row striking
- Winner found. It seems as if we have a winner! Unless anyone plans on contesting the world's current fastest Sudoku solver, user 53x15 wins with the staggeringly fast solver Tdoku. For anyone still working on their solvers, I'll still benchmark new submissions when I have time
- The code follows the idea shown in the algorithm flowcharts: a way to solve Sudoku faster than just with backtracking. This can be proven: run the script twice, first with solver.run() left out as it is, and second without that line (or with # before it) to skip the part that simplifies Sudoku before backtracking kicks in. Depending on the complexity, run time may decrease significantly
- 76.5k members in the algorithms community. Log In Sign Up. User account menu. 1. Fastest Sudoku Solver on Earth. Close. 1. Posted by 3 years ago. Archived. Fastest Sudoku Solver on Earth. jacklehamster.itch.io/sudoku... 0 comments. share. save. hide. report. 100% Upvoted. This thread is archived. New comments cannot be posted and votes.
- I had an assignment to do just that: build the fastest sudoku solver in Java. I ended up winning the contest with a time of 0.3 millisecond. I didn't use the dancing links algorithm and didn't compare with it, but some contestants must have tried it, yet my closest competitor took about 15 milliseconds
- utes, Kyle surely is the world's fastest sudoku solver About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test.
- The Kudoku Sudoku Solver. The Kudoku Sudoku solver is probably the fastest Javascript solver to date. Although faster algorithms exist, they have not been ported to Javascript so far as I know. (Emerentius's implementation in web assembly is now several times faster than this page). For more information on the Sudoku algorithms, see the Wiki page and my blog post

The most efficient Sudoku solver by far has been a very simple recursive solver, trying each candidate in turn, reducing the other candidates by r/c/b, and either finding it doesn't lead to a solution or does. You can either stop there (if you know it's a unique solution), or * SudokuSolver contains the algorithm to solve the Sudoku; it is a bruteforce algorithm*, but it recurses only on the cell with the least number of candidates, and before doing this it eliminates all the illegal candidates from the board

- Output: Grid after solve. Begin if no place in the grid is empty, then return true for number 1 to 9, do if isValidPlace(row, col, number), then grid[row, col] := number if solveSudoku = true, then return true grid[row, col] := 0 done return false En
- Mathematics of Sudoku explains this pretty well: The general problem of solving Sudoku puzzles on n^2×n^2 grids of n×n blocks is known to be NP-complete. The runtime complexity of any algorithm solving Sudoku is thus at least exponential in n. For a normal Sudoku (n = 3) this means O(N^3) is perfectly reasonable
- ute 23.93 seconds. The record was set on May 20, 2006 by Thomas Snyder, an American Sudoku champion.. How does Thomas Snyder solve Sudoku puzzles so fast, and how can you solve Sudoku puzzles faster

* We can now state Crook's algorithm for solving Sudoku puzzles on paper: 1*. Use methods 2 and 3 alternatingly to complete the puzzle as much as you can, until those methods lead no further The most basic way a computer can solve a Sudoku puzzle is to test all possible values for each remaining cell until a solution is found, or end without a solution whenallvalueshavebeentested. Thisisreferredtoasa brute force algorithm or a brute force search. The name brute force is commonly used in many compute Once you get stuck again, try the place-finding method again. Switching back and forth between the two place-finding method and the candidate-checking method will enable you to solve many of the Sudoku puzzles that you find in newspapers and magazines, and it's a relatively fast way of solving Sudokus Among Sudoku solvers the fastest tend to be cache and pipeline-friendly DPLL-style backtracking algorithms with compact data structures optimized for the required access patterns. They tend to explore the search space in basically the same way as DLX, so it's mostly a difference in constant factors This project is capable of solving a Sudoku puzzle using a genetic algorithm. Puzzle configurations are read in from a plain text file containing a string of 9 x 9 digits separated by spaces, with an example provided in the file puzzle_mild.txt. Zero is used to represent an unknown digit, whereas numbers in [1, 9] are assumed to be known/given

Star 1. Code Issues Pull requests. Sudoku Solver allows user to generate Sudoku puzzles with different levels of difficulties and and user can generate, play as well as solve the Sudoku with user-friendly interface created using C++ and Qt framework. c-plus-plus sudoku-solver sudoku-puzzle qt-framework * Sudoku solver algorithm*.

- The record was set on May 20, 2006 by Thomas Snyder, an American Sudoku champion. The fastest Sudoku solver - Code Golf Stack Exchange. Winner foundIt seems as if we have a winner! Unless anyone plans on contesting the world's current fastest Sudoku solver, user 53x15 wins with the staggeringly fast solver Tdoku. For anyone still
- To solve this, we will follow these steps −. Define a method called isPresentInCol(), this will take call and num. for each row r in the grid, do. if grid[r, col] = num, then return true. return false otherwise. Define a method called isPresentInRow(), this will take row and num. for each column c in the grid, do. if grid[row, c] = num, then return tru
- Cari pekerjaan yang berkaitan dengan Fastest sudoku solver algorithm atau upah di pasaran bebas terbesar di dunia dengan pekerjaan 19 m +. Ia percuma untuk mendaftar dan bida pada pekerjaan

purposes there already exists satisfactory algorithms, and it might be hard to see the beneﬁt of studying Sudoku solving algorithms. There is, however, still some value in studying Sudoku solving algorithms as it might reveal how to deal with diﬃcultvariationsofSudoku,suchaspuzzleswith16x16grids. Sudokuisalso,a All credit for the algorithm and beyond amazing mathematical explanations goes to Peter Norvig on this great article: Solving Every Sudoku Puzzle by Peter Norvig. However if you want to look at one of my own projects using this algorithm and program to make a graphical sudoku solver: the repository can be found her

Intelligent Sudoku Solver: Area: Intelligent Algorithm Duration: June 2012- June 2013 Abstract: Sudoku solving algorithm which is more efficient and faster than the common Sudoku algorithms, based on the pattern identification Table 1:The selected algorithms 3.3.1Brute-force method To solve a Sudoku puzzle using a brute-force method, one could do that by looping through each cells, one by one, and picking a number between 1 to 9. This could be done either in a speci ed sequential or a random order. If an invalid state is reached, i.e Which algorithm should I use to create a Sudoku solver? It depends on your goal(s). Abhi's answer is perfect if you want a fast solver. Depth-first search (or backtracking) is the fastest known method. If you want a pattern-based or pure logi.. ** Sudoku is a logic-based, combinatorial number-placement puzzle**.In classic sudoku, the objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9.The rules are simple: each number can only appear once in a row, column or subgrid. Sugolver is a Sudoku solver written in Go

Use Backtracking Algorithm to Solve Sudoku # javascript # webdev # beginners # algorithms. Christina Sep 4, 2020 ・3 min read. As promised in my recent article on how to design an algorithm, I am here to take a closer look at another popular technique for algorithm design called backtracking. Backtracking is a. Before moving on to introduce this algorithm, there are two points I would like to mention: In the paper, Crook mentions that a guess is necessary if there is no further possible step to proceed. I do not include the guessing to the script. Therefore, when you use this algorithm to solve Sudoku, it is possible that you cannot get the solution Las week we saw how to to implement a Sudoku solver using Python.The idea was to fill the most evident candidates for the empty cells and then make a guess for one empty cell and repeat the process recursively, backtracking when a guess led to a grid with no solutions Learning Recursive Algorithm with Sudoku Solver in Python. Ekapope Viriyakovithya. Oct 5, 2020.

sudoku solver Algorithm. player and investigators may use a wide range of computer algorithms to solve Sudokus, study their property, and make new puzzles, including Sudokus with interesting symmetry and other property. There are several computer algorithms that will solve most 9×9 puzzles. I recently wrote a small Python library for genetic algorithms (GA), called optopus.One thing I tried when I played around with it was to solve a Sudoku puzzle. There are plenty of efficient ways to solve Sudoku, but with my shiny new hammer, all problems look like nails The above link links to a trinket that contains the code, and an example, of the **Sudoku** **Solver** in action. It shows you when the **algorithm** backtracks when a candidate is no longer viable

The Simple Algorithm is to generate all possible configurations of numbers from 1 to 9 to fill the blank cells. you have to Try every configuration one by one until the correct configuration is found. second is the Backtracking Algorithm. Like all other Backtracking problems, we can solve Sudoku by one by one assigning numbers to empty cells I'm hoping to optimize my backtracking algorithm for my Sudoku Solver. What it does now: The recursive solver function takes a sudoku puzzle with various given values. I will scour through all the empty slots in the puzzle, looking for the slot that has the least possibilities, and get the list of values Sudoku Solved using Depth First Search (BackTracking) Algorithm. We can use Depth First Search Algorithm to Solve Sudoku. The keys are to find violations and backtrack when needed. We can use the hash sets to store the numbers that have appeared in 9 rows, 9 columns, and 9 squares Solving Every Sudoku Puzzle by Peter Norvig In this essay I tackle the problem of solving every Sudoku puzzle. It turns out to be quite easy (about one page of code for the main idea and two pages for embellishments) using two ideas: constraint propagation and search. Sudoku Notation and Preliminary Notion

This program demonstrates solving Sudoku puzzle using Grovers algorithm. The code supports both 4x4 and 9x9 Sudoku puzzles. For 4x4 puzzles, the same rules apply: The numbers 0 to 3 may only appear once per row, column and 2x2 sub square It won't be the fastest solver out there, but it will get the job done. Our Algorithm. The most basic way I could think of to write a Sudoku solver is to start at the first empty square, try a number, and check the row, column, and nearest 3x3 square for a match In Sudoku, the rules spell out how to solve the puzzle, so we can start there to make our first attempt at a solver (*foreshadowing alert: there will be more than one). We will need to write 3 main functions to check what possible values could occupy an empty square: A function to check the row for possible value

I do think it's probably true that dancing links wont be literally the fastest, but the neat thing is that it's a generic algorithm that solves ALL total cover problems, not just Sudoku. Of course a tuned Sudoku solver could probably beat it (optimizing around the Sudoku-specific parts), but it's nice to see that it's at least in the running They introduced the improved verity of Bee colony algorithm to solve puzzle with very efficiently. The study introduced the ABC algorithm Sudoku solver.so the improved Artificial bee colony algorithm is found the optimal result to all Sudoku puzzles testing. LINK [10]. A novel hybrid genetic algorithm for solving Sudoku puzzle Algoritme & Kunstig intelligens Projects for $30 - $250. I need a Sudoku solver in F#. I have one that solves in backtracking but I need some extra heuristics added to it. I also need one other solution using any other suitable algorithms for solving Sudoku.. Welcome to the tutorial on making a sudoku solver in python. I am going to warn you all, that this involves backtracking which is a pretty complex topic to get a grasp on if you are an absolute beginner/ rookie so I would advice looking at getting the grips of loops, functions and the basic instructions of python before you come to trying to understand this code Sudoku Solver by Andrew Stuart. Shows the logic behind solving Sudoku square by square. Sudoku Solver by Andrew Stuart. This uses a fast brute-force algorithm to check for all possible solutions. If it's valid, please use the Email This Board button to send it to andrew@str8ts.com

- Solving Sudoku Using Genetic Operations and Sub 1. SOLVING SUDOKU USING GENETIC OPERATIONS 1 Solving Sudoku Using Genetic Operations and Sub- Blocks With Optimized Mutation Rates Stephen Felman sfelman@eckerd.edu May 14, 2014 Abstract - This paper builds upon the idea of using sub-blocks as building blocks within Sudoku puzzles when attempting to use genetic algorithms to solve Sudoku puzzles
- I've been working on a Sudoku Solver, my current solver uses the backtracking algorithm but it still takes too long. I'm hoping to get it down to less than a second for most cases. As such, I've decided to rewrite it with the dancing links algorithm, understanding it is one of the better bruteforce methods that works well especially with a constraint problem such as the Sudoku Puzzle
- Sudoku Solver Algorithm Your Sudoku Generator algorithm may need to use a Sudoku Solver Algorithm in order to test whether a generated grid is solvable and to check that it only gives a single solution. The most common type of Sudoku Solver Algorithm is based on a backtracking algorithm used to investigate all possible solutions of a given grid
- Sudoku Puzzles¶ This module provides algorithms to solve Sudoku puzzles, plus tools for inputting, converting and displaying various ways of writing a puzzle or its solution(s). Primarily this is accomplished with the sage.games.sudoku.Sudoku class, though the legacy top-level sage.games.sudoku.sudoku() function is also available. AUTHORS

The standard Sudoku by itself is a very well known problem. It has been solved using just about every possible method, multiple times. Brute force algorithms can solve Sudoku, but aren't efficient in any sense of the term. Constraint satisfaction is exceptionally common and Sudoku almost seems like a mascot for attracting ne * I don't solve these puzzles*. Here is a diabolical puzzle with 26 clues: This one is particularly nasty. Try put it in Stuart's solver. It takes multiple steps of small eliminations before the puzzle can be solved. Meanwhile my solver takes only six guesses to solve it. Ultra-hard puzzles. Ok. So you've become a Sudoku master. You abhor. This assignment will require you to develop a Sudoku solver by applying search algorithms with heuristics to solve a puzzle. Puzzle Background The Sudoku puzzle is a 9x9 grid of squares, some of which contain number values from the start. Your goal is to add additional digits so that each row, column and 3x3 square contains the digits 1 to 9. Sudoku Maker is a generator for Sudoku number puzzles. It uses a genetic algorithm internally, so it can serve as an introduction to genetic algorithms. The generated Sudokus are usually very hard to solve -- good for getting rid of a Sudoku addiction Summary: In this post, we will learn What Sudoku is and how to solve the sudoku puzzle using the backtracking algorithm in C, C++, and Java.. What is Sudoku? Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9

- Sudoku Solver v2.0 for the Apple II. Michael J. Mahon & Scott Hemphill - July 8, 2006. Version 2.0 revision - July 15, 2006 . Introduction Sudoku is the name given to a type of logic puzzle similar in concept to a crossword puzzle. It is based on a 9x9 grid composed of nine 3x3 subgrids, where each grid box can contain a single digit from.
- and this gives the solver some encouragement to persist. This paper develops an algorithm for solving any Sudoku puzzle bypencil and paper,especially the ones classiﬁed as diabolical. Deﬁnition of the Sudoku Board Sudoku is played on a 9 × 9 board. There are eighty-one cells on the board, which is broke
- This is one of the fastest Sudoku solvers I've ever written. It is compact enough - just 150 lines of C++ code with comments. I thought it'd be interesting to share it, since it combines several techniques like reactive network update propagation and backtracking with very aggressive pruning
- This article describes a solution written in c++ for solving a Sudoku puzzle, with the fastest time possible. At this point, I cannot claim this algorithm to be the fastest because I haven't compared it with other algorithms which might be better. This program uses a rule-based algorithm to solve a given puzzle

You are given a 9 X 9 sudoku which is assumed to have only one unique solution. Each cell may contain any one of the characters from '1' to '9' and if it's an empty cell then it will have the '.' character. Solve the given Sudoku puzzle by filling in the empty cells. A sudoku solution must satisfy all of the following rules Sudoku solver can solve any Sudoku puzzles instantly, find all solutions of multiple answer case of Sudoku puzzles. Placing some numbers on 9x9 grid, pushing Solve button, one solution is indicated on the board. Then, pushing Solve button again, another solution is indicated if exists. Like this, pushing Solve button repeatedly, all solutions are indicated An algorithm combining a constraint-model-based algorithm with backtracking would have the advantage of fast solving time, and the ability to solve all sudokus. The fastest Sudoku solver can solve even the hardest Sudoku in about 1 millisecond and solve most others in 0.1 millisecond The Pure backtracking solution for this problem is described here.It is strongly recommended that the reader know how the pure backtracking solution works before move on. In the pure backtracking solution, we iterate through the matrix and whenever an empty cell (cell without any digit) is found, we assign a digit to the cell, where such digit is not present in the current column, row, and 3. An algorithm in this thesis refers to an ordinary computer science algorithm that can be used to solve a Sudoku. Backtrack: An algorithm is backtracking if it can go back to a previous state, often with a recursive call. Box: A sub grid that consists of 3×3 cells. There are 9 boxes in a normal Sudoku. Brute-force: Also known as exhaustive search

C++ SUDOKU SOLVER Problem Statement: Given a partially filled 9x9 you have to fill it with numbers 1 to 9 as per the following principles. Principle of Solving sudoku: No row must have duplicates ; Algorithm: Create a loop in which we fill the space with possible options of 1 to 9 In part 1 of this Sudoku solver with python tutorial I explain how we are going to go about solving the problem and discuss the algorithm known as backtracking.Backtracking is simply reverting back to the previous step or solution as soon as we determine that our current solution cannot be continued into a complete one Algoritm & Artificiell intelligens Projects for $30 - $250. I need a Sudoku solver in F#. I have one that solves in backtracking but I need some extra heuristics added to it. I also need one other solution using any other suitable algorithms for solving Sudoku.. A backtracking algorithm is a recursive algorithm that attempts to solve a given problem by testing all possible paths towards a solution until a solution is found. Backtracking algorithms can be used for other types of problems such as solving a Magic Square Puzzle or a Sudoku grid

Every sudoku puzzle start with some cells already containing a number. limits the ability to solve sudoku puzzles with increasing complexity. For Sudoku puzzles with low order (3, 4) this is usually not an issue today, as even small If the algorithm has managed to move beyond the bounds of. Algorithm description. Instead of using a brute-force method, it is possible to modify an existing Sudoku puzzle so that it remains valid. It turns out that any cell can be swapped with another one (in the same 3 x 3 matrix, of course), as long as the corresponding modifications are made along their rows or columns free solver that considers individual 3x3 grids.According to a survey hosted on a 2011 blog post by user attractivechaos [9], which was later referenced by Iyer et al. [30], The fastest known Sudoku solvers use a version of backtracking or dancing links. A variety of soft-computing algorithms were also proposed, all of which use eithe

algorithms that solve Sudoku puzzles imitate the human solver while others use the guessing strategy. Guessing involves inserting values and seeing if the y lead to a solution * amount of effort to generate efficient algorithms to solve these puzzles*. Some researchers might even suggest that an algorithm to solve Sudoku games without trying a large amount of permutations does not exist. This paper describes the development and implementation of a Sudoku solver using MATLAB. Keywords -Backtracking algorithm, Matlab I get a lot of traffic to this blog because of my Sudoku solver. Google analytics tells me most of it lands on the original version that I wrote, and not the optimised version that's now the worlds fastest XSLT 2.0 solution - an issue which this post should hopefully rectify. The puzzle on the right is apparently the worlds hardest Sudoku puzzle.If I run my solver Sudoku.xslt using Kernow's. Sudoko Solver using Backtracking Algorithm. Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contain all of the digits from 1 to 9

- netic algorithms performs well though is does not solve all cases. Geem in [3] is proposing a Sudoku solver model based on harmony search that mimics the characteristics of a musician. As mentioned in [4] the performance of the algorithm is not that good and it solves puzzles in less than 40 seconds and 300 iterations
- You may assume that the given Sudoku puzzle will have a single unique solution. The given board size is always 9×9. Sudoku Solver using Backtracking Algorithm in DFS. The Sudoku can be solved by pure bruteforce algorithm (the complexity is ) . However, the complexity is enormous and can't be solved practically
- In this blog, I will explain how to solve a Sudoku puzzle using a simple AI program written in Python. First, let me explain the game. Sudoku is a mathematical game consisting of 9 grids. Each of these grids are further divided into 9 cells. We have to fill these grids with digits from 1-9. However

Here we will see how we can make a simple sudoku solver robot which can solve any sudoku puzzle for us within a very few seconds. Rules Of Sudoku: So before we make our own robot to solve sudoku, lets review the rules of sudoku: Sudoku is played on a grid of 9 x 9 spaces. Within the rows and columns are 9 squares (made up of 3 x 3 spaces) Algorithm: Create a function that checks if the given matrix is valid sudoku or not. Keep Hashmap for the row, column and boxes. If any number has a frequency greater than 1 in the hashMap return false else return true; Create a recursive function that takes a grid and the current row and column index. Check some base cases

- Logical deduction puzzles like sudoku can often be modeled as consisting of a large number of similar and independent deductive steps, making them amenable to concurrency-based implementations. Sudokami is a concurrent sudoku solver written in Go, a sketch of some of my ideas along these lines. Here's how it works
- g a Sudoku solver is not very difficult. Even though Sudokus are known to be NP-complete, because the n in a 9x9 Sudoku is fairly small, brute forcing a solution can be done in a few seconds. The more interesting task is to write a human-like Sudoku solver that uses human-possible techniques to identify the next move
- The final approach is creating a rulechecking algorithm. A rulebased algorithm tries to solve sudoku much like how a human would. The algorithm analyzes There are several methods for finding missing numbers in sudoku, this algorithm implements some of these methods
- istrator Posted in Computer Science , Computing Concepts , Python - Advanced , Python Challenges The purpose of this Python challenge is to demonstrate the use of a backtracking algorithm to solve a Sudoku puzzle
- e the difficulty of a Sudoku puzzle. This is because there is no standardized metric for deter
- Sudoku solver algorithm Sudoku was (and still is for me) an addictive numerical pizzle for killing time and also training the brain. Even now, I see books offering Sudoku exercises in a bookstore, and of course many apps that offer exercises in App Stores.However, when any challenge falls on a programmer's hand, wat he immediately think

- The fastest Sudoku solver can solve even the hardest Sudoku in about 1 millisecond and solve most others in 0.1 millisecond. An inefficient algorithm can be 3 to 4 order of magnitude slower than an efficient one, so choose the algorithm carefully
- ation. One of the things I that drove me crazy about Sudoku is how difficult it is to return to a puzzle if you get interupted. This syste
- In this tutorial, we've discussed two solutions to a sudoku puzzle with core Java. The backtracking algorithm, which is a brute-force algorithm, can solve the standard 9×9 puzzle easily. The slightly more complicated Dancing Links algorithm has been discussed as well. Both solve the hardest puzzles within seconds

Mantere et al. [15] studied the cultural algorithm based algorithms to solve and analyse Sudoku. An improved version of graph matching algorithm was developed by Cordella et al. [16] while Eppstein [17] has shown how graph can be used to solve Sudoku. Rodrigues Pereira et al. [18] applied constraint programming to solve Sudoku Fastest Sudoku Solver app let you solve any Sudoku Puzzle just by taping a button. Sudoku Solver app allow you to Enter any Sudoku Puzzle in a very easy manner. It will display the solution before twinkling of an eye. This Sudoku Solver App has these unique Features that make it different and best among all Sudoku solver apps In order to solve Sudoku puzzle, we must know the technique that basically use in solving the puzzle in a fastest way. Most of the techniques that player used are difficult to understand. Thus, the player will This study has introduced algorithm to solve diagonal Sudoku 9x9 grid To solve the sudoku, you need to fill in the digits such that your solution violates none of the constraints. It can be harder than it sounds..not for a computer though. In this article, we will learn how to write Java code that solves sudoku within seconds. The world record for solving a Sudoku is 1 minute 23.93 seconds. Let's break that

In this post, I will introduce a Sudoku-solving algorithm using backtracking.If you don't know about backtracking, then just brush through the previous post.. Sudoku is a 9x9 matrix filled with numbers 1 to 9 in such a way that every row, column and sub-matrix (3x3) has each of the digits from 1 to 9 This paper studies the problems involved in solving, rating and generating Sudoku puzzles with genetic algorithms (GA). Sudoku is a number puzzle that has recently become a worldwide phenomenon

Sudoku Solver Yixin Wang wangyix@stanford.edu Abstract--- An Android app was developed that allows a Sudoku puzzle to be extracted and solved in real time using captured images from the device's camera. The user sees a near real-time feed of the device camera. If the camera sees a Sudoku puzzle with reasonabl To solve a Sudoku puzzle, download the two files, enter the Sudoku matrix that you want the algorithm to solve at the top of solve_sudoku.m (an example for the formatting is included in the file), save, and run solve_sudoku.m. I tested my code using the following puzzle. It's rating is fiendish

One of the fastest I've seen is the kudoku implementation in C. It claims to solve a 1000 hard sudoku problems in less than 2 seconds. If you were ever stumped at Sudoku before, now you know you don't have to be ever again To solve a **sudoku**, start by lining up and numbering all of the rows and columns. Be aware that the basic rule of **sudoku** is that every large square, column, and row must have all of the numbers from 1 to 9, so look for missing numbers. If you see a single empty in a larger square, fill that in first The best Sudoku Solver as Service. A sudoku solver service.Array of string, Each element in this array has 3 digits, first digit is rowsecond is columnthird is value Each element corresponds to a field on Sudoku board.Solution as int[][] Array. Array of rows Making sudoku solvers is a hard / interesting problem, so it's best to save it for a different question. Or you can just read this and see how you go. To generate a solved puzzle, simply run the solver on an empty board. The only caveat is you should randomise the guesses that the solver uses, otherwise you might end up with the same puzzle.