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The goal of Sudoku is to fill in a board of 9×9 squares with numbers so that each column, row, and 3×3 block contain the numbers between 1 to 9. At the beginning of the game, the board will have some of the squares filled in. Your job is to use logic to fill in the missing numbers and complete the grid. Don’t forget, a move is incorrect if: You can play 5 new Sudoku puzzles every day with levels ranging from Very Easy to Very Hard. We hope you'll enjoy some fun and challenging Sudoku puzzles.

To play this game you can use a combination of game buttons and keyboard keys.

Great satisfaction is often the reward after having solved a Sudoku puzzle. Especially if it has been a particularly tricky one.

Sudoku is a logic game. Applying strategies to logic games will help you solve Sudoku puzzles more quickly. You probably already use some strategies without thinking of them as strategies. In this section we'll introduce 6 basic strategies.

A traditional Sudoku puzzle consists of a board of 9x9 cells as seen in the picture below. This board has rows (A), columns (B), and blocks (C). Each cell can have a number from 1 - 9. Possible numbers in a cell are called candidates. The basic strategies often mention these terms: rows, columns, blocks, and candidates.

The first two of the six basic strategies are used to savely determine a number in a given cell. The last four strategies are used to eliminate numbers.

Naked Singles
This is the simplest strategy. If a cell in a row only can have a single candidate number, let it be number 5, then this number (5) must go in that cell. This strategy also applies to columns and blocks.

Hidden Singles
Same as Naked Singles but the same cell can have other candidates as well but they can be removed because the Hidden Single must go in this cell.

Naked Pairs
Same logic as Hidden Singles but now we are talking about two numbers instead of one. If a pair of numbers in a row can only appear in two cells you can savely remove the same two numbers if they are present in the same two cells' column and block. This is also true for Naked Pairs appearing in a column.

Hidden Pairs
Just like Naked Pairs but with an extra twist. Now, the cells with Naked Pairs also have other candidates. But as we know that the Naked Pairs must reside in these two cells, we can savely remove the other candidates.

Naked Triples
Building on top of the strategy of Hidden Pairs we have Naked Triples which can be a little tricky to spot. If three numbers are candidates in three cells inside a row then for each of the three cells you can remove the same numbers if they are candidates in other cells column- and block-wise. What makes this tricky is that all three numbers need not be candidates in the same cell. Let's say you have three cells sharing the candidates: 4, 5, and 6. They are distributed in this way: 45, 56, 46. This setup is also called Naked Triples.

Hidden Triples
Again same logic as the previous strategy. However, this time the cells also have other candidates. This simply means you can savely remove these other candidates.

1. The name "Sudoku" comes from two Japanese words: "su", which means "number," and doku, which means "single." Translated, it mostly means "single numbers only.
2. Sudoku isn't a Japanese game at all. It's American invented. Howard Garns created it as Number Place in 1979 but died in 1989 before Japanese publisher Nikoli got a hold of it. The game didn't really take off until 2004 though, when Wayne Gould convinced The Times in London to publish it.
3. British Airways absolutely forbids its flight attendants from solving Sudoku puzzles during either takeoff or landing.
4. There are 6,670,903,752,021,072,936,960 possible combinations for completing a 9-by-9 Sudoku grid, but only 5,472,730,538 of them really count for different solutions. Needlessly to say, you need a handful of lifetimes to solve all of them.
5. When Sudoku became a world hit in 2005, it is estimated that it is the biggest phenomenon since the Rubik's Cube in the 1980s.
6. Sudoku is a logic game and involves absolutely no math. Sometimes Sudoku puzzles even come with pictures, letters or symbols instead of numbers.
7. The first World Sudoku Championship was held in Italy in 2006 and has been held annually since in different locations.
8. Playing Sudoku regularly can have benefits, like boosting your concentration and focus, preventing or easing depression and possibly even preventing dementia and Alzheimer's disease, according to some studies.
9. Sudoku is good for anyone and any age and helps develop mental abilities as well as keeps them in good condition.

Just like physical exercise, your mind needs some exercise, too. Doing Sudoku is a great and fun way to do so. However, Sudoku is not the only brain games available. There are many other brain games that can pump up your brain such as crossword puzzles, Wordfeud, Rubiks Cube, and Worduku just to mention a few.

Crossword puzzles
This is one of the best known brain game and comes in all kinds of difficulties. Doing crosswords regularly improves your vocabulary and strengthens your memory.

Wordfeud
This brain game took the app world by storm. Wordfeud was launched in August 2011 and quickly gained hugh popularity. It's inspired by the traditional board game Scrabble where you lay down tiles of letters next to each other to form a word.

Rubiks Cube
Originally called Magic Cube was invented in 1974. Its mainstream popularity peaked in the 1980s and is considered the world's top-selling puzzle game. A traditional Rubiks Cube is covered with multicoloured squares, which the player attempts to twist and turn so that all the squares on each face are of the same colour.

Worduku
Like Sudoku, Worduku uses letters instead of numbers. The rules and strategies used is just like Sudoku.