Game AI needs to complement the quality of a game. For that, we need to understand the fundamental requirement that every game must have. The answer should be easy: the fun factor. So, what makes a game fun to play? Answering this question is the subject of game design, and a good reference is The Art of Game Design by Jesse Schell. Let's attempt to tackle this question without going deep into game design topics. We'll find that a challenging game is indeed fun to play. Let me repeat: it's about making a game challenging. This means the game should not be so difficult that it's impossible for the player to beat the opponent, or too easy to win. Finding the right challenge level is the key to making a game fun to play.
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