BBC News writes:
"Mobile giant Nokia has begun a second assault on handheld gaming, with the launch of the N-Gage platform.
The company has shifted its approach, from focusing on a dedicated games system to titles which can be played on a range of Nokia devices.
At launch, only owners of the N81 can use the service but the firm plans to roll it out to other N-series phones.
N-Gage has the support of developers such as EA, Gameloft and Vivendi, who are making titles for the platform."