Sudoku: Brain challenge

Sudoku is one of the most popular puzzle games , brain challenge game with extremely simple rules is to fill a 9x9 grid with numbers so that each row, column and 3×3 section contain all of the digits between 1 and 9.
Sudoku is also an excellent brain game. If you play Sudoku daily, you will soon start to see improvements in your concentration and overall brain power.
Let's start now:
* Features:
- Complete daily challenge for monthly gold cup.
- Top scoring board
- Find mistakes by yourself or display them automatically.
- Activate note mode, every-time you input a number into cell the note will be updated automatically.
- Highlight repeated number in the column, row or block (3x3).
- Hint for you at a standstill.
- More over 10,000 maps.
- 4 levels: easy, medium, hard and expert.
- Support for both smart-phone and tablet.
- You can play the game without internet.

Let's enjoy, thank you for playing the game.