You can download the daily Sudoku app for free on your Android phone and you can collect points by solving easy, intermediate and expert sudokus each day. Also you can solve previous days sudoku to increase your points. The scoring system will be fair as everyone will solve the same sudoku.
Sudoku is a puzzle game that people of all ages can easily learn with basic logical reasoning. The game, known to come from Japan, has the phrase "SUDOKU" from the combination of the words "Suuji wa dokushin ni kagiru" .

There are three basic rules for the Sudoku game.
* All numbers must be present in each line and these numbers must be included only once.
* All numbers must be present in each column and these numbers must be included only once.
* All numbers in each region should be found and these numbers should only take place once.

Key Features
* 3 levels - easy, intermediate and expert. Suitable for beginners and experts.
* Daily Challenges - Solve sudoku with 3 difficulty levels each day and rise in the leaderboard.
* Note Taking - Click the pencil button to take notes. Your notes are automatically edited when you enter a new value.
* Hint - Select the cell you want to get hints and click the hint button to get the hint.
Highlight - Highlights the row, column, and region to which the cell you selected is linked. It also emphasizes cells equal to the value of the cell you select.

The Sudoku app offers a simple interface for beginners and experts. Choose the day from the calendar that comes up and start playing immediately. Complete all the difficulty levels per day not only to kill time, but also to practice.