World of War craft is one of the most popular online games in the world. Players move their characters, known as avatars, around the game’s imaginary world. The avatars explore new places, fight scary monsters, search for wealth, and interact with other players. In 2005, the game’s maker, Blizzard Entertainment Inc., created a very powerful virus and put it in a few of the game’s areas as a challenge for the most advanced players. The company tried to keep the virus in only certain areas, but just as would happen in real life, the virus escaped. Disaster followed.