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raywenderlich.com[^]:

When you make a game, you often have enemies for the player to combat. You want these enemies to seem intelligent and present a challenge to the player to keep the game fun and engaging.... Obviously I can’t cover everything in this introductory tutorial, but I can show you how to get started with a hands-on example of adding AI into a simple game! In the process of adding AI into this game, you’ll learn about two common AI techniques along the way: steering and finite state machines.