In this chapter, we covered a lot of useful game AI, such as seeing and hearing, state machines, probability, and evolution. In the process, you made a demo with bots that can attack the player, and you added some basic game elements to accommodate this demo, such as bot health and dying, regeneration, and a simple overlay framework showing a heads-up display. As mentioned before, how you implement AI is really up to the needs of your game. A lot of the work will just be in finding a good balance that makes the game both challenging and fun. And sometimes you just have to find that balance by trial and error. So experiment, make the bad guys smart, and make some games with some cool AI.