Here is the sudoku - I could think the following only.
The top number box 3 coloumn wise should have some number - 6,7,3 (in some order). The box 3 column 2 -- 2,5,8 ( in some order), and box 3 column 3 - 1,4,9 in some order. Rest, I am really not able to identify what is wrong.
I am really clueless here, I am not able to think further. What logic am I missing here?