Sudoku Attack

Sudoku Attack is played with the basic rules of the popular sudoku game.
If youve never played sudoku, the rules are very simple: you have to fill it with the numbers 1 to 9 in the empty squares. You should not repeat numbers or row or column or the box.

What is special in attack mode is that every time you solve a square, sudoku disguises and reappears, but scrambled. But do not be fooled, the sudoku is the same and what is left for you to finish is what should be.
There are four buttons for the different levels, and 1,000 sudokus to solve.

Go ahead!