Call of Duty: United Offensive was the first expansion for Call of Duty. It introduced multiplayer.
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How Treyarch evolved its own brand of Call of Duty multiplayer (updated)

  • Posted byby Dean Takahashi
  • Updated
  • 5 min

[Updated 5/28/15 with corrections.]

Multiplayer combat in Call of Duty changes with every new release in the first-person shooter series. Sometimes, it seems the changes aren’t that big, but viewed over time, you can see some significant updates and improvements. These decisions helped turn Call of Duty into a multibillion-dollar annual franchise.

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Written by

Dean Takahashi

Dean Takahashi is editorial director for GamesBeat. He has been a tech journalist since 1988, and he has covered games as a beat since 1996. He was lead writer for GamesBeat at VentureBeat from 2008 to April 2025. Prior to that, he wrote for the San Jose Mercury News, the Red Herring, the Wall Street Journal, the Los Angeles Times, and the Dallas Times-Herald. He is the author of two books, "Opening the Xbox" and "The Xbox 360 Uncloaked." He organizes the annual GamesBeat Next, GamesBeat Summit and GamesBeat Insider Series: Hollywood and Games conferences and is a frequent speaker at gaming and tech events. He lives in the San Francisco Bay Area.