Sudoku

The game of Sudoku is presented as a table of 9 × 9, composed of 3 × 3 sub-tables called regions, boxes, or blocks. A total of 81 cells.
To start playing, click on the central image of the first screen.
Increasingly generate a new Sudoku, the difficulty of this new board will depend on the color icon located on the first screen, the color indicate the number of cells that stay with the numbers visible, being green easier and red the most difficult.
In the first screen we also have a speaker icon to indicate whether or not the game will sound.
The objective is to fill the empty cells, with a number in each, so that each column, row and region contains the numbers 1-9 only once.
In addition, each number of the solution appears only once in each of the three directions.
To select the number to change, click on it, a red box indicating that the cell is selected will appear.
Once selected cell press anywhere on the screen below the board to be changing the numbers, each press will be added each currently selected number.
Game rules:
1- must complete the empty boxes with a single number from 1 to 9.
2 in the same row can be no repeated numbers.
3- in the same column can be no repeated numbers.
4- in one region can not be repeated numbers.
5- The game ends when all the numbers are completed.
Have fun !!