Introduction – International Sudoku Day is celebrated every year on September 9 across the world to promote the logic-based puzzle game Sudoku and introduce it to those people who are not still aware of this fun game. The main aim of this puzzle game is to fill a 9×9 grid with all digits between 1 and 9 in every column, row, and 3×3 square. As per the Sudoku game rules, there is no number that can appear twice in a column, row, or square. A date September 9 or 9/9 was selected as the International Sudoku day due to the game that is based on the number nine.

History – As per information, Indiana architect Howard Garns created Sudoku, a puzzle game that was published in ‘Dell Magazine’ in the year 1979 under the name ‘Number Place’. Firstly, this puzzle game revolutionized the Japanese puzzle market that got the name Sudoku. The people of Japan previously love this puzzle game and soon become popular with millions of Sudoku players.

Wayne Gould, a retired Hong Kong judge, developed a computer program which could be made new Sudoku puzzles in the year 1997. When publications such as The Conway Daily and the Times of London started publishing sudoku puzzles then this puzzle game gained popularity across the world in the year 2004. After that, the World Puzzle Federation declared that International Sudoku is celebrated on September 9, 2013.

Significance – Sudoku is a puzzle game that is enjoyed by everyone including adults, children elders, and youths. This puzzle game helps in strengthening the concentration and developing problem-solving capabilities. It keeps the brain active, helps with decision-making, and improves the number skills. Sudoku also helps in lowering stress and anxiety by concentrating to solve puzzles. It also improves thinking skills, memory, and logical thinking. This puzzle game promoted a healthy mindset and fun for the entire family. Thus, the main goal of this international day is to encourage people to play the puzzle game, Sudoku.