Sudoku is a logic-based number puzzle that has gained immense popularity over the years. However, this addictive game is not always called by the same name in different parts of the world. In Japan, where it originated, it is referred to as "suji wa dokushin ni kagiru," meaning "the digits must be unique." In Spanish countries, it goes by "sodoku," while in Greece, it is called "soudokou." In some parts of the US, it is known as "the number puzzle" or simply "sudoku." In essence, regardless of what it's called, sudoku remains a highly entertaining and challenging game that stimulates the mind.