Sudoku Generator And Solver Java

net introduces you a first version of SUDOKU ONLINE SOLVER. Fill in the blanks so that each row, each column, and each of the nine 3x3 grids contain one instance of each of the numbers 1 through 9. This solver offers a number of features to help you improve your solving skills and practice solving strategies. The two main programs described in this book are the Solver and the Generator. Quick, Cryptic and Themed UK Style Crosswords. The basic rules of Sudoku are easy. The source code and files included in this project are listed in the project files section, please make sure whether the listed source code meet your needs there. Fill in the grid so that every row, every column, and every 3 x 3 box contains each of the given letters. Puzl helps you solving a puzzle: whilst entering numbers your puzzle is continiously validated, a mismatch is immediatly visible on screen. Ranking table is cleared at the beginning of each month. The Naive Algorithm is to generate all possible configurations of numbers from 1 to 9 to fill the empty cells. Sudoku in JavaScript. In order to use the SAT solver to solve a Sudoku puzzle, you need to represent the Sudoku puzzle as a propositional formula, using the Formula datatype you've already created. Many tips and tricks and sudoku rules for beginners. Easy Sudoku for Sun 10/Nov/2019. A sudoku solution must satisfy all of the following rules: Each of the digits 1-9 must occur exactly once in each row. Could you post your input that's taking a long time to run?. - SudokuBacktracker. a guest Oct Not a member of Pastebin yet? Sign Up, it unlocks many cool features! raw download clone embed report print Java 405. How to write a mini sudoku in 4x4 puzzle using java The entries of each grid are 1,2,3 or 4 only. Play Puzzles USA Today's Sudoku. I know there's a bunch of ways to program a Sudoku solver, including a brute force/recursive approach and a logical approach. Save games to complete later. There are some very nice thoughts about a sudoku solving algorithm online, make sure you check it out. Place digits from 1 to 9 in each empty cell. Sudoku puzzles have only one rule, but they can be fiendishly difficult to solve. Sudoku in JavaScript. Some people call it newspapers saver because it boosts their sales and keeps the reader audience. Java Sudoku can also solve the puzzles. 0 - Open Source Sudoku Game Solver Generator for Windows PC Desktop - Top4Download. This class guesses numbers for cells (starting with 1) and then backtr Sudoku Solving Java Program (Java in General forum at Coderanch). Sudoku Multi is a fun and engaging free online game. For those of you who don't know what Su Doku is, it is a simple and elegant puzzle comprising of a 9x9 grid of squares. It permits larger puzzles, but be warned that the 36x36 puzzles may take some time to create and solve. The puzzle finally became popular in the U. The object is to fill all empty squares so that the numbers 1 to 4 (for 4x4 puzzles) or 1 to 6 (for 6x6 puzzles) appear exactly once in each row, column and box. sudoku solver and generator. Sudoku Fact. The sudoku board is broken down into nine 3x3 squares. Sudoku is a fun way to pass the time, and it’s even more fun once you learn to make your own puzzles. Highlight the conflicting cells. Note that complicated puzzles (in the case of the classic 3x3 Su Doku puzzle, 'complicated' usually means with less than 24 filled cells) might take a considerable time to generate. Sudoku Generator Sudoku Solver Daily Sudoku Killer Sudoku Generator Killer Sudoku Solver Super Sudoku Generator Super Sudoku Solver Samurai Generator Samurai Solver Godoku Solver Home News How To Play Sudoku Sign Up! Member Profile Competition The Sudoku Program Sudoku FAQ Newsletter Sudoku Books Sudoku Links Sudoku Syndication Contact Us. * It can solve Sudoku by the automatic operation. Random puzzles every time you play. 100000 Grids 4 levels. Any cell number that is grey is not necessary for the puzzle. Sudoku is a fun and engaging free online game. salut! :) I started developing the Sudoku for Android with the intention of using a random generator of puzzles that will change as per stipulated time. I particularly like the one Peter Norvig describes in Solving Every Sudoku Puzzle. Download: Sudoku. Those who are working on writing Java sudoku solver might want to have a look at an eight queens puzzle or some other similar one. You are currently on the page to make our Legacy Sudoku Puzzles. Empty cells are indicated by the character ‘. The solver works quite simple: given a cell to be filled in, try all possible values and solve the rest of the board. Im trying to make a sudoku puzzle generator. Download Killer Sudoku Generator - best software for Windows. This article is on the implementation of a Sudoku game in Java. The task is to generate a 9 x 9. The Sudoku Solver uses several techniques to solve Suduko puzzles,including X-Wing, Simple Colouring, Outside Chains, XY-Wing, Swordfish and Jellyfish. edu Abstract. Brute force, Generate and Test both perform pretty well for easy puzzles but Arc Consistency beats them all in speed and solving very complex puzzles with less CPU. Creating Sudoku Puzzles Control # 2883 February 19, 2008 Abstract We consider the problem of generating well-formed Sudoku puzzles. Rules: Fill in the grid so that every row, every column, and every 2x2 box contains the digits 1 through 4. All of these backtracking puzzles use some form of the same source code, which helps when it comes time to solve the problem. Includes option to show the solution. What is sudoku? Sudoku is a unique logic-based, combinatorial number-placement puzzle. Read DZone's 2019 Machine Learning Trend Report to see the future impact machine learning will have. And once you have created the puzzle, how do you rate it for difficulty unless you actually solve it, which they don't because there are too many (I am currently solving #2,467,499,532). Aug 16th, 2013, 11:37 PM #3. The minimum number of hints is currently 56 in 16x16 Sudoku. Practice your sudoku skills with a range of free games and printable worksheets that provide puzzles for both beginner and expert. The aim of a Sudoku puzzle is. The objective is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the digits from 1 to 9. Programi(ranje) Sudoku. Welcome to Daily Killer Sudoku. The last step is to put our Sudoku Solver in Action! We enter a grid to solve and then, we call the solve method in the main entry point of our class. A simple way to generate random Sudoku is that 1) generate a random completing Sudoku, that is, generate random Sudoku no square is blank. Empty cells are indicated by the character '. This does not solve Sudoku (or Su Doku) puzzles but it should allow you to complete them more easily and quickly. numbers are from one to nine and refer to a series of Sudoku puzzle books by Frank Longo. Solve them yourself (with help from HoDoKu's hint system) or let HoDoKu do it for you. Sudoku generator/solver/analyzer written in Java (English and German). To solve a Sudoku without backtracking, you could generate every possible solution, then evaluate all of them and collect the. Puzzles may be created in a variety of fonts, font sizes, and colors. This page contains a complete Java implementation of a Sudoku puzzle solver. In this post, I will introduce a Sudoku-solving algorithm using backtracking. There are different types of hints available to help you solve a Sudoku. Pairs memory game - Pairs memory game for mobile Java enabled devices let's you play the popular card game for free on your mobile phone. Java Solution. The solver and generator is implemented using efficient algorithm. It allows you to generate completely random Sudoku puzzles, enter your own puzzles from newspapers and magazines, or load Platforms: *nix. It allows you to generate sudoku puzzles in five different and configurable difficulty levels. Instead, it can generate them in different levels of difficulty. Thank you :) also i need to be ble to add it into a script. Older puzzles are in the archives. New! You can now create a Daily Killer Sudoku account! Save part-finished puzzles, switch between devices, track your progress through the archives and record your solving times. The solver itself is a basic implementation of Knuth's DLX algorithm. Read DZone's 2019 Machine Learning Trend Report to see the future impact machine learning will have. In this post, I will explain how to solve a printed sudoku solver using a real-time feed from a camera, such that If the captured image contains a sudoku puzzle, the puzzle will be solved and the result will be printed on the clear cells. In this post, I will introduce a Sudoku-solving algorithm using backtracking. java sudoku solver program Although almost all of the Sudoku answers could be done with the following code, there was no data in the data (all zeros) for the trial, and the problem was a very distorted hint (array [ If [0] is executed with 1 to 9 (others are zero), etc. * continueWith: This is used to specify what are the next states to look at. Normally 9x9 puzzles use the numbers 0 to 9, but for larger grid sizes there are not enough numbers and so letters are used instead. OpenSky Sudoku Generator. 0 - Open Source Sudoku Game Solver Generator for Windows PC Desktop - Top4Download. One might think that it was that easy, but with your current approach one of three things can happen: The result has exactly one solution (A traditional Sudoku) The result has many solutions (Not seen as a traditional Sudoku, as there's no way to logically deduce one solution). com offers free software downloads for Windows, Mac, iOS and Android computers and mobile devices. Backtracking Algorithm Like all other Backtracking problems, we can solve Sudoku by one by one assigning numbers to empty cells. Sudoku generator/solver/analyzer written in Java/Swing (English and German). Maximum points per days is 128. How to Solve Sudoku using Hadoop ? By ayalcinkaya In this jar file there is an example to solve sudoku problems. Each cell should contain // a digit in the range 1. Continue reading Sudoku Solver→. @Michael Leo : The sudoku solver stops solving as soon as it finds one solution. Instead, it can generate them in different levels of difficulty. Using PyEDA to Solve Sudoku¶. This solution uses DFS (Depth First Search) Algorithm and looks for a unique solution to the given Sudoku Puzzle. Generating Sudoku Boards pt. Random puzzles every time you play. When you are done, click ' Solve Sudoku ' to find out the solution for the remaining cells. Here is the short explanation you can skip and the full code is in the end. There is another efficient solution using dancing link but more harder to code. Here is a selection of printable Sudoku puzzles for Kids. Nikoli's puzzles are featured in ALL Japanese newspapers and magazines. The final solution generates completely random Excel Sudoku puzzles with four levels of difficulty. Here is a free Sudoku generator that can generate puzzles of varying difficulty in PDF, Postscript, plaintext, and HTML. If there are still many solutions, then repeat 3). There is another efficient solution using dancing link but more harder to code. Using a Python recipe? Installing ActivePython is the easiest way to run your project. Some people call it newspapers saver because it boosts their sales and keeps the reader audience. There are five puzzles on this page: two killer sudoku puzzles and two “greater than” sudoku puzzles and one “greater than-killer” sudoku puzzle. This is a practical book that will provide you with everything you need to write your own books of Sudoku Classic and Samurai puzzles. Java Sudoku can also solve the puzzles. Empty cells are indicated by the character ‘. The following problems is 56-hint problem. If a puzzle is the wrong difficulty we throw it away and generate another candidate. The term ‘sudoku’ was created in Japan in the 1980s, but the number puzzles are much older than that! Similar number grid puzzles first appeared in newspapers in France in the late 19th century, but disappeared shortly after World War I. A page with the missing puzzle squares, or 'answer tiles', can be added. Welcome to HoDoKu, a Sudoku generator/solver/trainer/analyzer HoDoKu is a sudoku helper written in Java and available in English and German. Select from any of the free past crosswords. A professional tool to be able to solve complex sudoku games. Killer Sudoku and Super Sudoku. Sudoku, sometimes spelled Su Doku, is a placement puzzle, also known as Number Place in the United States. Rules: Fill in the grid so that every row, every column, and every 2x2 box contains the digits 1 through 4. QQwing - Sudoku Generator and Solver - posted in Utilities: QQwing is a Sudoku puzzle generator and solver. Includes option to show the solution. This page contains a complete Java implementation of a Sudoku puzzle solver. Many tips and tricks and sudoku rules for beginners. Java Sudoku is an open sourced cross platform version of the popular Sudoku logic game that is written in Java. The Assistant can help you with scanning,. When the puzzle is completed, a mystery word will be found running through the highlighted squares in the puzzle. Backtracking: Solve Sudoku in Java This post demonstrates solving Sudoku using Backtracking. Create random sudoku grids or design your own to play/solve. First enter the numbers of the sudoku directly in the grid or enter them via the "Load" and "Seed" buttons. And I feel like I've somehow overcomplicated things by taking a very brute-force approach to generating the puzzles. zip has the following entries. I took somewhat of. Shidoku, also known as Children Sudoku, is the smaller and easier 4x4 variant of Sudoku. Sudoku Solver. Every row, column and major 3x3 // square should contain all the digits 1. Sudoku Solver Java Code with GUI The following source code and examples are used to solve Sudoku Game. Compatible with all browsers, iPad and Android. Older puzzles are in the archives. Level one puzzles are the easiest and level nine are the hardest. Please feel free to. ArrayList; import java. Killer Sudoku and Super Sudoku. The code I wrote to generate and solve Sudoku puzzles for this game is based on his solver. Play unlimited Sudoku online from Easy to Evil. is reviewed by. of wrapping a "Sudoku generator" around such a solver if possibly the solver code does not terminate when presented with a puzzle for which no solution or multiple solutions exist. We support a 8x8 (with 4 numbers and 3 sub-puzzles) and a 21x21 (with 9 numbers and 5 sub-puzzles) sized version. This approach has many advantages: It can solve any Sudoku. Wikipedia says that it was created by a US puzzle magazine, but popularized (and given its recognized name) by the Japanese. Introduction Sudoku is a popular puzzle where you place digits from 1 to 9 within a 9x9 grid according to certain rules. Create your free Platform account to download our ready-to-use ActivePython or customize Python with any packages you require. A Sudoku library for Java and Android. A MIDlet for mobile phones is also available. In all columns there should be elements between 1-9 , without repetition. Add a comment about the puzzle to our online forums. Backtracking Algorithm Like all other Backtracking problems, we can solve Sudoku by one by one assigning numbers to empty cells. How to solve Number puzzles? You can easily solve all kind of Number puzzles by practicing the following exercises. I found a sudoku generator (and solver) in javascript @ this place made by a guy named David J. Some cells have // given values. Check out the online demo to see it in action. Sudoku Online 9×9, 6×6 and 4×4. Enter your puzzle into the grid. Sudoku in JavaScript. Generates, plays, and solves Sudoku puzzles. Java QQWing. Export sudoku grids as PDF, RTF, HTML, XML and CSV. A professional tool to be able to solve complex sudoku games. Nine grid sizes from 4x4 to 16x16. Many tips and tricks and sudoku rules for beginners. If you are planning to generate thousands of Sudoku puzzles, you will want this version. Solving it turns out to be easier than I expected, but a somewhat odd example of test-driven development. Generate Sudoku in your web browser using QQWing. Register for a free account to generate exclusive Sudoku puzzles and solve any valid Sudoku puzzle in a newspaper or magazine. In order to use the SAT solver to solve a Sudoku puzzle, you need to represent the Sudoku puzzle as a propositional formula, using the Formula datatype you've already created. Sudoku, originally called "number place" is a logical game invented by Swiss mathematician Leonhard Euler in the 18th century. Sudoku Solver and Generator [Download Sudoku Solver and Generator Here]When I first posted my Sudoku Solver I mentioned that there are many such programs available. The object is to fill all empty squares so that the numbers 1 to 4 (for 4x4 puzzles) or 1 to 6 (for 6x6 puzzles) appear exactly once in each row, column and box. With Java Sudoku you can create random sudoku grids or design your own to play/solve, and it can be used as a sudoku generator and solver. Solve them yourself (with help from HoDoKu's hint system) or let HoDoKu do it for you. World's hardest sudoku: can you crack it? Readers who spend hours grappling in vain with the Telegraph's daily sudoku puzzles should look away now. Depending on your programming experience and how good you are with java, you can use a nasty if structure that can actually allow you to generate 13 122 (729*18) sudoku puzzles. We have the world exclusive: the first truly interactive Killer Sudoku solver and generator. Note that complicated puzzles (in the case of the classic 3x3 Su Doku puzzle, 'complicated' usually means with less than 24 filled cells) might take a considerable time to generate. 0 */ public class SwingSudoKiller extends SudoKiller { /** * Draw the game board. LeetCode - Sudoku Solver (Java) Write a program to solve a Sudoku puzzle by filling the empty cells. The first solution will be a simple brute-force attack. Welcome to my Sudoku X Solver. Among randomly generated boards, the latter seem far more common than the former. * It will deprive of the enjoyment of solving. RSS Reader - A web based RSS reader written in Perl. Puzzle Books Sudoku Coded Crosswords Fill In Crosswords Mystery Crosswords. ' as spaces. It can solve tough Sudoku with in few seconds. It was a cool page (and one I had a vested interest in since I had a hand in the Java solver) but sadly dropped off the web sometime in 2008. Sudoku puzzles (Su Doku) My database includes 6913752 puzzles for the moment and I'm constantly generating more. The first thing I tried yesterday was to translate the Matlab function for verifying a Sudoku puzzle into Java. Rather, it allows you to track the consequences of the settings in each cell of the SuSoKu grid, so that a solution can be found. jain: 8757: Fri Feb 12, 2016 2:33 pm surendra. For simplicity you may assume that there will be only one unique solution. Online Wordoku Puzzle. You can play 6x6 Sudoku puzzles here, and a standard Sudoku grid can be solved using the tool here. OK, I Understand. In addition, you will find here some tutorials that describe how to create and print Sudokus yourself. Play Sudoku - Play this fantastic puzzle game that is taking the world by storm!! New puzzles every day! Help. Provider of Sudoku puzzles for newspapers and other publications. Sudoku is a logic-based, combinatorial number-placement puzzle. Java Sudoku can also solve the puzzles. Each block is divided into its own matrix of nine cells. Generate and enter/solve Sudoku puzzles against the clock. Interactive Sudoku Solver Our new interactive Sudoku Solver will take you step by step through the process of solving a Sudoku puzzle using up to 36 different methods. You’ve seen Sudoku, the “number place” puzzle. [email protected] Every row and every column intersection number must be unique in that row and column. Given a, possibly, partially filled grid of size 'n', completely fill the grid with number between 1 and 'n'. Sub Goal 1: To get left side image, you need to get right side image first. This happens because VERY difficult Sudokus are the target audience of my solver. After you choose or cretaed a sudoku puzzle, you can play it online on screen or print it out and play it offline. Sudoku and CU. 6 Mobile Sudoku Solver is a Java (J2ME) application for solving, designing and playing Sudoku puzzle game on mobile devices. Description: Fill all of empty squares in the grid with a picture. The experience was fun, so I thought I’d write up a little bit about the algorithm I’ve used and some interesting stats about how it performs. Sudoku Generate your own Sudoku - Very Easy to Difficult - and solve it online ! Use the Solver to get the answer to any Sudoku !. If a Sudoku square is empty, the corresponding cell in "values". java - package sudoku import java. Solving it turns out to be easier than I expected, but a somewhat odd example of test-driven development. Free Sudoku Puzzles. Helps you to improve your solving skills and practice solving strategies. The final solution generates completely random Excel Sudoku puzzles with four levels of difficulty. Assuming you have a function which knows how to solve such a puzzle it is easy to show the user the solution of the puzzle. It is fast. Rules: Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9. Welcome to Daily Sudoku Solver. You can use this website to solve any sudoku you need help with. You are currently on the page to make our Legacy Sudoku Puzzles. Stuck on a sudoku puzzle in a newspaper or magazine? Enter the digits and get the solution instantly!. Solve them yourself (with help from HoDoKu's hint system) or let HoDoKu do it for you. We have the world exclusive: the first truly interactive Killer Sudoku solver and generator. You can Generate puzzles in sizes from 4x4 to 16x16 and difficulties from very easy to very hard. To play, complete the grid so that the numbers in the dashed cage sums to the total and every row, column and every three-by-three box contains all the digits 1 to 9. solve(board) def solve Share my java solution with comments. As long is you are running a random int from 1 to 9 and placing it in one spot of the array you should be able to generate 729 (9*81) different sudoku puzzles. HoDoKu is a sudoku helper written in Java and available in English and German. Goal: If you see left side image, that is what you need to generate sudoku puzzle. We will now create a Sudoku solver using backtracking by encoding our problem, goal and constraints in a step-by-step algorithm. In that case, "Sudoku Generator" is an excellent tool for those who want to test themselves and improve their Sudoku solving skills. Please feel free to. A lot of easy sudoku's for children and beginners to learn the basics needed to solve the puzzle. It features a Generator to generate random Sudoku Grids of various complexity as well as a Solver to solve any provided Grid using backtracking. Print Puzzles Monthly Puzzles 16x16 Sudoku Mobile Devices Crosswords. Customize your puzzle's difficulty, generate, and print in seconds. See screenshots, read the latest customer reviews, and compare ratings for Sudoku Solver Generator. HoDoKu is a sudoku helper written in Java and available in English and German. Java Sudoku is an open source cross platform version of the popular Sudoku logic game that is written in Java. Introduction to Sudoku Puzzles Sudoku, or Su Doku, is a fun and addictive Japanese puzzle game that has become a world-wide phenomenon, with thousands of puzzles available in books, newspapers, and even online. Can be used as sudoku generator, solver. Killer Sudoku and Super Sudoku. Following are the rules of Suduku for a player. Many tips and tricks and sudoku rules for beginners. Assuming you have a function which knows how to solve such a puzzle it is easy to show the user the solution of the puzzle. 1: Structure & Algorithm. One might think that it was that easy, but with your current approach one of three things can happen: The result has exactly one solution (A traditional Sudoku) The result has many solutions (Not seen as a traditional Sudoku, as there's no way to logically deduce one solution). Source file Prolog source file: sudoku. This application is coded for solve Sudoku Game. ArrayList; import java. In all columns there should be elements between 1-9 , without repetition. No installation is required, simply download Sudoku. Hopefully, it's simple and straightforward to use, but if not, I give some explanation below. What is sudoku? Sudoku is a unique logic-based, combinatorial number-placement puzzle. The algorithms draw heavily on the Chakra engine’s support for ECMAScript 5 standard array operations to rapidly solve many Sudoku games. It is slower than it could be, because your browser does the heavy lifting with a javascript, and that isn't very fast. Java Sudoku Solver. Sudoku solver. There are some very nice thoughts about a sudoku solving algorithm online, make sure you check it out. net] Released a simple Sudoku grid generator and solver (Open source) By a_bertrand , November 7, 2007 in General and Gameplay Programming This topic is 4353 days old which is more than the 365 day threshold we allow for new replies. In order to use the SAT solver to solve a Sudoku puzzle, you need to represent the Sudoku puzzle as a propositional formula, using the Formula datatype you've already created. Sudoku is a fun way to pass the time, and it's even more fun once you learn to make your own puzzles. QQwing - Sudoku Generator and Solver - posted in Utilities: QQwing is a Sudoku puzzle generator and solver. Create random sudoku grids or design your own to play/solve. The Sudoku class is a helper class used when generating grids, and it has methods generate and cull, which generate a new puzzle and clear items from it respectively. In their development, I gave priority to clarity rather than efficiency. In the sudoku solver this is used when a intermediate sudoku is reached to specify what the next candidates are. Enter numbers into the blank spaces so that each row, column and 3x3 box contains the numbers 1 to 9 without repeats. It allows to generate random, to solve given or generated sudoku puzzles, print, as well as to support Dancing Sudoku v. Freeware download of SuDoku Solving Assistent 0. Hi, This is an ideal job for someone who has already created a sudoku generator, and would like to make some money off it. Latin squares and Sudoku programatically generated are show below. There is only one rule to completing a sudoku: each 3x3 box, each row and each column, must contain each of the digits from 1 to 9 without repetition (there are nine cells in every row, column and box). To generate a random fully filled sudoku table is easy, but the challenge is to eliminate certain numbers until it becomes a puzzle. New! You can now create a Daily Killer Sudoku account! Save part-finished puzzles, switch between devices, track your progress through the archives and record your solving times. Description: Fill all of empty squares in the grid with a picture. Sudoku puzzle for kids and beginners. All of these backtracking puzzles use some form of the same source code, which helps when it comes time to solve the problem. Sudoku is a logic-based, combinatorial number-placement puzzle. generate generate sudoku solve solve sudoku sudoku sudoku solver. If you have no good algorithm yet, stick to the hard-coded for now. The game acquired its present form, however, only in the 70s of the 20th century, when American Howard Garns revised and published it in a special printed edition. It also includes a solver and an analyzer to help you solve the puzzles. Sudoku Solver & Generator Tool might be your first step. In order to use the SAT solver to solve a Sudoku puzzle, you need to represent the Sudoku puzzle as a propositional formula, using the Formula datatype you've already created. The singlemostimportanttoolfor solving Sudoku puzzles is based on the definition of the solution of a Sudoku puzzle. Read DZone's 2019 Machine Learning Trend Report to see the future impact machine learning will have. HTML CSS JS. Play unlimited Sudoku online from Easy to Evil. Below is a sample puzzle of Shidoku. Normally 9x9 puzzles use the numbers 0 to 9, but for larger grid sizes there are not enough numbers and so letters are used instead. Nine grid sizes from 4x4 to 16x16. Sudoku is a 9*9 grid in which each row,each column and each 3*3 grid contains all numbers from 1 to 9 only once. Turning on help will mark all possible fields for the selected number. Sudoku puzzles (Su Doku) My database includes 6913752 puzzles for the moment and I'm constantly generating more. The problem of Sudoku generalized to an n x n board is NP-Complete. The concept to learn is Backtracking. Who should I contact? E-mail should be addressed to [email protected] Icons Source Files. If you don't know about backtracking, then just brush through the previous post. Here is the short explanation you can skip and the full code is in the end. The minimum number of hints is currently 56 in 16x16 Sudoku. You can play any of them online or print them out to play offline. Over the past few months, I built an implementation of Donald Knuth’s Algorithm X using Dancing Links in Java to solve Sudoku puzzles. Sudoku generator/solver/analyzer written in Java (English and German). That was impressive enough but thanks to Keith B. Hari's Mind--Excel Su Doku Solver, Helper & Puzzle Generator Sudoku Generator by Jeremy Travis.