You must protect the little girl from the evil creatures at all cost, if she dies you'll lose the game. In this game you must be cautious as the enemy could attack any moment. Also you need to solve some mysteries to make your way further. Just explore the entire place to search for keys or clues. Battle your way through the abandoned city protecting a little girl from the evil creatures.

Let's start to understand the structure of game AI systems by taking a virtual microscope and looking inside a single AI entity. It can be a Quake enemy, an Age of Empires army, or the creature from Black & White. Understanding the major building blocks will later help you structure and code your systems efficiently.