There’s a taxi driver in Stockholm known by the Web alias of Taxi31 who spends all his time between passengers shooting people. In Copenhagen, ferocious street battles flare daily between dozens of young men.

The carnage occurs with cellular phones, not guns — courtesy of new technologies that allow cell phone users to locate each other to within several hundred meters.

Two small companies — It’s Alive of Sweden and Wireless Factory of Denmark — have carved out early positions in a new genre of location-based game-playing and entertainment that will likely expand soon from Europe to North America.
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