Sudoku is one of the most popular puzzle games in the world, played and enjoyed by millions of people for its simple rules and complex problem-solving challenges. But how did Sudoku develop to this point? The game first appeared in Japan in 1984 where it was given the name “Sudoku". The word "Sudoku" actually comes from a Japanese phrase containing words beginning with "Su-" and "Doku-". The word "Sudoku" was simply invented, much like "Hi-Fi" comes from the phrase "High Fidelity".