Interactivity! After dozens of years of hype it is still a word that excites, attracts, sells, and confounds people.

In the game industry interactivity is very tangible. It is a key feature that helps guarantee the success or failure of a product. Just how interactive is a game? “How is the game play?” designers ask. They are asking about the level of interactivity.

The game play had better be very interactive if the game is to sell at the level that publishers require. Take Electronic Arts’ million-seller Knockout Kings, for example. If you want to take on Muhammad Ali or George Foreman or Oscar De La Hoya, you can encounter virtual adversaries who present their style, their skill, and their fighting philosophy right in a ...

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