Mobile devices offer the opportunity to play games nearly everywhere. Moreover, networked games allow individual players to interact with other people and to participate in a larger gaming world, which also provides for new business opportunities. Hence, we currently see an increased interest from game developers, providers and players in mobile games. In this paper we propose a novel architecture and platform for games on the IMS. This allows games to utilize the features and capabilities that are inherent to the IMS. At the same time existing games can be flexibly adapted to this new type of network and have the possibility to reserve network resources for game data transmission, thus improving the experience of players. Categories and Subject Descriptors K.8.0 [General]: Games, C.2.1 [Network Architecture and Design]: Wireless communication General Terms Design, Standardization. Keywords IMS, Mobile Networked Games, Platform Architecture.