This is a game of Gobang.（五子棋）
I have done 2 extensions of the background. You can open the (1,2,3).png to see the changes. The first time,I change the yellow background by the Img,and then I change the transparency(透明度) of the Img.
Also,I want to make it a online game,but I have no enough time.
If you want to run it,doad it to your computer,the code are all in the wuziqi file.