Very Easy To Win
You just have to fill the right boxes in in the right order.
1 - Row 1, Column 1
2 - Row 3, Column 1
3 - Row 3, Column 3
4 - Row 2, Column 2
(Rows in order from top to bottom, columns in order from left to right.)
Nice game, easy to play and win, all in all I rate it 8/10 stars and 4/5 in the side bar.