I have seen demos of pure CSS Tic-tac-toe games, but I was unable to find a version that truly works. If I have missed it, please send me link, so I can see how another dev has created it.
Quick math game using CSS counters and specified increments. No JavaScript.
Blog post: [Fun Times with CSS Counters](http://codersblock.com/blog/fun-times-with-css-counters/)
双面胶