One Sudoku - All-In-One Sudoku Login

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Frequently Asked Questions

• When do you find a hidden single in Sudoku?

  If when you cross the rows and columns you find a blank space with only one possibility, you have found a naked single and the right answer for that cell. Hidden singles are in fact naked singles that occur once you add a new digit to a row or a column. Keep your pencil notes updated and check them often through the game to find these.

• Can you play Sudoku for free on the Internet?

  Within no time Sudoku free puzzles will be your favorite online game. The popular Japanese puzzle game Sudoku is based on the logical placement of numbers. An online game of logic, Sudoku doesn’t require any calculation nor special math skills; all that is needed are brains and concentration.

• When do you use a singleton in Sudoku?

  A "singleton" is a trivial case where there is only one empty cell in a "region" (row, column, or block). In this case, the number value of that cell has to be the number that is missing in the region: it is both the only place where the missing number can go (hidden singleton) and the only value that the empty cell can accept (naked singleton).

• What is the object of the game Sudoku?

  The object of the game is to fill in the Sudoku grid with a series of one-digit numbers, each of which appears only once in a given row, column, or 3x3 block. At the start, certain numbers are provided in the Sudoku grid, which serve as clues to help the player gradually solve the entire puzzle.

• Why is Sudoku so addictive?

  [And Sudoku] is one of the most addictive puzzles ever invented. What makes it so addictive? It's the appeal of the empty squares to be filled in, which is a quality it shares with crosswords, and it has very simple rules. You can learn it in 10 seconds, and yet the logic needed to solve Sudoku is challenging.

• How do you solve Sudoku?

  There are two main techniques one can use to solve a Sudoku puzzle; Crosshatching and Penciling In. These two techniques are simple, straightforward, reliable, and sufficient in solving most standard Sudoku puzzles. It is important to understand that all Sudoku puzzles require an iterative approach.

• What is the key to solving a Sudoku puzzle?

  The obvious way to solve a sudoku puzzle is to find the right numbers to go in the squares. However the best way to start is the other way round - finding the right squares to hold the numbers. This uses a technique called 'crosshatching', which only takes a couple of minutes to learn.