The Killer Sudoku variant combines elements of Sudoku and Kakuro. A killer sudoku puzzle is made up of 'cages', typically depicted by boxes outlined with dashes or colours. The sum of the numbers in a cage is written in the top right corner of the cage, and numbers cannot be repeated in a cage.

Welcome to 24/7 Sudoku -- the best in free, online sudoku games! 24/7 Sudoku offers all the difficulties a beginner or seasoned sudoku player will enjoy! This free sudoku website features hundreds of Easy Sudoku puzzles, Medium Sudoku puzzles, Hard Sudoku puzzles, and Expert Sudoku puzzles! 24/7 Sudoku is sure to keep you playing this great sudoku game all day, every day!


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Sudoku is a brain challenging number game, played on a 9x9 sudoku board. The sudoku board is broken down into nine 3x3 squares. The object of the sudoku game is simple. Every row, column, and 3x3 box in the sudoku board must contain the digits 1 through 9 only once! As the difficulty progresses, the sudoku game becomes harder, and you'll have to employ more advanced and strategic logic to solve the puzzles.

To play 24/7 Sudoku, employ the basic object of the game by clicking an open space and either typing the number that belongs, or selecting it from the numbers on the side of the sudoku board. If the number is correct, the sudoku tile will slide into its correct slot. If not, the number will return to the outside and time will be added to your overall sudoku game time. To highlight numbers, click a number that has aready been placed inside the sudoku puzzle. As the game progesses, you may want to use notes. Click the pencil in the right bottom corner to turn the numbers into notes. Just click it again to return to puzzle number form.

Welcome to our free daily sudoku games. Fill in each square with a number, making sure no number repeats in each column or row. Check back each day for a new puzzle or explore ones we recently published.


Worried about damaging your sudoku puzzle with eraser marks? When you play our free online sudoku game, there's no need! You can choose easy sudoku, medium sudoku, or even sudoku for experts if you are confident. You can place notes, find sudoku tips, manage the timer and save the sudoku game by clicking the menu bar in the top-right corner. The goal of the game is to fill every square on the grid with a number from 1-9, where the numbers can only appear once in every row, column and 3x3 box. The best part of the game: This free online sudoku game delivers a new puzzle each and every day!

Once I ran into your GitHub account and I saw the sudoku repo I didn't open it though because I don't like spoilers hahaha so I decided to make my own sudoku solver that like your first version only solve easy ones...I tested it using the Gnome sudoku from ubuntu 14.04 and It solves easy and medium level of difficultly this is the repo github.com/lmbarr/sudoku-solver

Amazing, the sudoku part almost exactly mirrors my experience.

I first wrote it in javascript, with sets of possible numbers for every cell and human-like non-destructive transforms being applied (only answers we are sure about). There were quite a few different transforms, because I picked a modified version of Sudoku which had these additional blob sum constraints, which were interesting because they were indeed sums and not sets of the [1,9] range.


For the UI, it used Vue, but really the renderer was mostly handwritten svg. It solved the lesser difficulties, but then I got bored.

Later, I stumbled upon someone quoting the backtracking algorithm as described in wikipedia. So I implemented it in Rust, with the additional constraints. The first time I wrote it, it solved them all in negligible time. I also tried it 3x4 and 4x4 boards. 4x4 gave noticeable time, and anything above 4x4 took too long to run.

Perhaps applying human-like transforms is computationally valuable at bigger board sizes to reduce the iteration space dramatically.

Maybe I'll still port those, or make the rust code an API or a WASM embed to the UI. Probably not though.

Another one! I wasn't given a Sudoku solver to do as part of a class (I trained in engineering), but have done one recently simply because it's really interesting. Pretty sure this one is efficient (github.com/rantydave/sudoku), took a lot longer than a couple of hours :)

Not saying that the code is inefficient, but I've created an algorithm which will solve the sudoku puzzle like we humans do (i.e. there would be no hit and trial of numbers). I wanted to make my own sudoku puzzle and solve it, but the thing is I couldn't make the question set. Whenever my algorithm would finish placing the numbers, it always turned out that a number was present twice in its undesired area. Help anyone?

Welcome to the daily sudoku game from the San Diego Union-Tribune and Los Angeles Times. Fill in each square with a number, making sure no number repeats in each column or row. Check back each day for a new puzzle or explore ones we recently published.

We've got more than one million unique sudoku puzzles available for play, both online and the old fashioned way - with pencil and paper. Feel free to solve online just for fun, or, for an added challenge, register a free account and compete against thousands of other solvers to make it into our Hall of Fame!

The Puzzle Baron family of web sites has served millions and millions of puzzle enthusiasts since its inception in 2006. From jigsaw puzzles to acrostics, logic puzzles to drop quotes, numbergrids to wordtwist and even sudoku and crossword puzzles, we run the gamut in word puzzles, printable puzzles and logic games.

#6746, December 29:

Ā Competition Sudoku Puzzle - Diabolical level of difficultyWelcome to the Daily Sudoku Competition. The rules are simple, just print out the Sudoku from the link below and when you have completed it enter the numbers in the graphical sudoku board (yes it's a form!).You need to enter your name, email address and country. If this is your first timethen it will automatically create a personal history for you so you can keep track of yoursubmissions and try for the Experts list. Anyone can get into the Top Sudoku Expert list - this is now the sum of all your correct entries for thelast three hundred and fifty days.

Read the Web Site Update announcement for the update on submitting.

The competition cut-off time is midnight EST (GMT-5) and 5:00am (GMT) UK Time.


CLICK HERE FOR PRINTABLE VERSION - (With Candidates)

Ā Please NOTE: There is now a Sudoku Solver available - click HERE

I have been trying to create a sudoku puzzle in Anaplan and validate the inputs. I created a module to input numbers and loaded result too in another module. In order to validate the input, applied CF by comparing inputs to result.

A sudoku is a grid of nine blocks, each containing nine squares. Some of the squares will already have a number between 1-9 in it. Your job is to enter numbers into the blank spaces so that each box, column, and row contains the numbers 1-9.

While these tips will get you a long way, we encourage you to visit Wikihow for their wonderfully simple guide. This guide will take you further in cracking the harder levels: Take me to the guide on Wikihow About Sudokupeople Sudoku puzzles are fun, addictive, fascinating and require no language or math skills. And did you know that doing sudoku puzzles helps develop logic and difficulty levels? ff782bc1db

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