Video games are designed to entertain, but what does that exactly mean? What makes the little interactive stories and puzzles of games fun? Well, in most cases it's all about simulating an experience, especially one that the player will never actually have in real life. Some games manage to create a truly immersive simulation while others seem to miss the point entirely. The most important thing a game designer has to remember is that a game is best when it is designed around the thing being simulated rather than plopping that thing into a series of designs and mechanics that don't have anything to do with the fantasy the game is supposed to be playing out. This is the major distinction between, say, two of the most memorable super hero games in history, Superman 64 and last year's Batman: Arkham Asylum. The latter represents the best case scenario for a video game about an iconic comic book hero while the former has long been Exhibit A in the ongoing case for how not to design a game.