Uncover Mysteries Of Numbers app for iPhone and iPad

This is a puzzle game about numbers.
The rules of the game are as follows:
1.There is a 9 by 9 grid, and you need fill it with numbers 1 through 9.
2.The 81 squares will be pre-filled with numbers, and you need to figure out from those numbers what numbers do you need to fill in the remaining squares.
3.When all the numbers in the game panel are filled, you need to make each row and column appear only once.
You need to fill in all the numbers in a limited amount of time to win the game.