Even when solving a hard puzzle, it’s a great opening move to fill in a good number of squares. This process of elimination is a fast, easy, and highly effective method to solve lower-level puzzles. In grids with many unfilled squares, this is often the only way to narrow down where to place a number. Scanning is especially effective when you’re looking at both rows and columns at the same time. The goal is to look at all the boxes where the number can’t be placed, hopefully leaving the one box where it should be. This involves picking a number and then looking at rows and columns across the grid containing that number. The most basic technique for solving free online Sudoku is to use the scanning method. Of course, free online Sudoku that can be played at any time of day soon followed. Sudoku quickly spread to newspapers all over the world, delighting users every single day. Sudoku games were introduced in Japan five years later, where the number puzzles became immensely popular and were officially coined 'Sudoku.' In 2004, The Times in London published its first daily Sudoku, reintroducing the Sudoku puzzle to Western culture. His Sudoku used a 9x9 square, and all rows and columns needed to contain the numbers 1-9. These number puzzles disappeared around World War I, but reemerged in 1979 when an Indiana man named Howard Garns published the first modern Sudoku puzzle. The rows and columns did, though, add up to the same number.

The number puzzles were not the exact same as sudoku, though, because they contained some double-digit numbers and did not have sub-squares. Number puzzles became popular in the late 1800s in France, when newspapers began to publish partially-filled number grids on their pages. Additionally, the puzzle is updated every day giving you a new Sudoku challenge each and every day! Sudoku History We offer Sudoku for beginners, medium Sudoku, and Sudoku for experts.

Our free online version of web Sudoku follows in the number puzzle's classic tradition, no pen or pencil needed! As you start the puzzle you can choose your Sudoku difficulty. Think you have what it takes? About Sudoku Playing sudoku daily can boost your concentration, ease depression and even prevent Alzheimer's disease.While free online Sudoku can be rather challenging, the rules and general game play are pretty simple and straightforward.Įach column, row and nonet needs to contain the numbers 1-9, and each number can only be used once. Can you imagine that there are 5,472,730,538 possible sudoku puzzles? The Times in London helped spread Sudoku to Western culture by publishing its first daily sudoku in 2004. Therefore, in the sudoku game, we have to fill in numbers without repetition. What is Sudoku? 'Su' in Japanese means numbers while 'Doku' means single. The best part of the game: This free online sudoku game delivers a new puzzle each and every day! Interesting Facts about Sudoku 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. 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. 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.

Sudoku free puzzles