Sudoku is a logic puzzle game that has been played for hundreds of years. It has become increasingly popular in recent years and is now played by millions of people around the world. The objective of the game is to fill a grid with numbers from 1 to 9, placing the numbers in a way that does not repeat within the grid.

There are several ways to play Sudoku, including by using a pencil and paper, and by using the Android app. In this game, you can choose from four difficulty levels. The first level is very easy, and the last level is very difficult.