A free program for Android, by foo Game Group.

Sudoku is a logic-based number puzzle game. It has been played for thousands of years in different forms, and is still one of the most popular and challenging puzzle games. The game is simple and easy to play, yet can provide hours of enjoyment and challenge. It has become a popular hobby and pastime for many people, both children and adults, and is even used in some therapeutic settings.

The objective of Sudoku is to place numbers 1 through 9 in a 9 × 9 grid so that each number can only appear once in each row, each column, and each 9 × 9 grid.

To help you, you will have a pencil and eraser. Use the pencil to remove errors, or make any changes you want.