my sudoku puzzle

I made this sudoku puzzle myself. I didn't copy it from a magazine, newspaper, interenet etc. etc. It's possible and i tried that already.

EXPERT Level. If you don't know what a sudoku is it's a japanese puzzle wherin you have to fill the 9x9 grid with the numbers 1-9 and each number can only be used once in every box (3x3), column (up and down) & row (across).

dare to answer?..it's not that hard^^