Can you recommend other resources and reading materials other than this? I would like more on top of the provided links thank you. OP's url have got me interested in AI now, but mainly for solving puzzles like this.
What you're asking for is actually pretty broad. A lot of CodeCombat can be played with traditional Game AI strategies to try and defeat the opponent. It's one subfields of AI I've done very little research in, so take what I say with a grain of salt, but it's my understanding that the best resources for learning Game AI are actual books on the subject. I would love for someone to prove me wrong, but I don't remember too many great online sources when I was trying to learn the it.
Before you start reading about different AI tactics, I would recommend just going through CodeCombat and trying out some of your own strategies. You'll get a much more intuitive sense for why things work, as well as how you would apply different strategies to your particular game.
