Fun in Numbers (FinN) is a platform for developing and playing mobile, locative and collaborative distributed games using wireless sensors. Using FinN, a very large and diverse set of games can be enhanced, by maximizing the on-game experience and collecting statistics for off-line, web-based view. At the same time the essence of such games remains the same: fun in large numbers, in every place and at any time. FinN is implemented using a combination of JAVA Standard and Mobile editions, while on the hardware part we use wireless sensor devices, called Sun SPOTs. In the future, mobile phones that have some kind of sensors embedded, or other custom devices can be used for the same purpose. We report a number of examples of games created with FinN and briefly present the architecture of our platform.