Tic Tac Toe
This is the Active CSS version of the classic Tic Tac Toe (aka Noughts and Crosses)!
Note that this is relatively advanced, but there is not a lot of code involved.
If you are struggling with any concepts in here, you should go through the docs in sequence until you feel up to reading this code. Experienced devs who have done this tutorial in other frameworks will get an idea of how you approach this sort of thing in Active CSS by looking over this example.
Have a look at the HTML and CSS first, as you'll need to understand that to make sense of the ACSS.
If you play the game too, the code should start to make sense. You might need to look up and down the code a few times and check out any unfamiliar code in the documentation before it all clicks...