Do You Sudoku?
Sudoku are easy to learn yet highly addictive language-independent logic puzzles which have recently taken the whole world by storm. Using pure logic and requiring no math to solve, these fascinating puzzles offer endless fun and intellectual entertainment to puzzle fans of all skills and ages.

Sudoku is a number-placing puzzle based on a 9x9 grid with several given numbers. The object is to place the numbers 1 to 9 in the empty squares so that each row, each column and each 3x3 box contains the same number only once.
Sudoku puzzles come in endless variations and range from very easy to extremely difficult taking anything from five minutes to several hours to solve. However, make one mistake and you’ll find yourself stuck later on as you get closer to the solution ... Try these puzzles, and see if you can solve them too!

Rules
Sudoku rules are extremely easy: Fill all empty squares so that the numbers 1 to 9 appear once in each row, column and 3x3 box.

Tips

• Use a soft erasable pencil
• Always double check before placing a number
• Start with the easy puzzles, then move on to the harder ones
• Stuck with a puzzle? Go to Solution Examples to learn new techniques
• Make small pencilmarks to show which numbers are allowed in empty squares. This will come handy when analyzing techniques are used.
• Never guess! Only make moves based on logical deductions
• Note: There is only one unique solution for each puzzle.

For an interactive Conceptis Sudoku tutorial, click here.

About Conceptis Ltd.
Founded by Dave Green, Conceptis Ltd. is the leading supplier of picture-forming logic puzzles to magazine and book publishers worldwide. Based in Israel, Conceptis Ltd. offers more than 6,000 new puzzles each year to magazines, books and mobile content providers in 25 countries all around the globe, including the United States, United Kingdom, Japan, France, Germany, Spain, The Netherlands, Italy, Hungary and Finland.

The History of Sudoku
The Sudoku concept was not invented in Japan as many people may believe, but the name Sudoku was. The origin of Sudoku can be traced back to Swiss mathematician Leonhard Euler, who devised 'Latin Squares' in 1783, which he described as 'a new kind of magic squares'. Euler created a grid in which every number or symbol appears once in each row or column.

Sudoku puzzles were first published in the late 1970’s in Math Puzzles and Logic Problems magazine by Dell Magazines. Dell took Euler’s Latin Square concept and applied it to a 9x9 grid with the addition of nine 3x3 boxes, each containing all numbers from 1 to 9. Dell called the puzzle “Number Place” and still do today.

In 1984 Nikoli, Japan’s leading puzzle creating company, discovered Dell’s version and decided to present it to their Japanese puzzle fans. The puzzles, which were first named Suuji Wa Dokushin Ni Kagiru, (“the numbers must be single” or “the numbers must occur only once”) quickly became popular.

In 1986, after some important improvements were added, mainly by making symmetrical patterns and reducing the number of given clues, Sudoku became one of the best selling puzzles in Japan. Realizing that the only problem with the Sudoku puzzles was their long name, Kaji Maki, the president of Nikoli abbreviated it to Sudoku - (Su = number, digit; Doku = single, unmarried). Today, there are more than 600,000 copies of Sudoku magazines published solely in Japan every month.