This thesis considers how to achieve efficient multiplatform mobile software development. A mobile application is developed as a vehicle to demonstrate how this can be done in a particular instance. The educational mobile game is focused on road safety for pedestrian, mostly children. The thesis is divided in several parts. In the first section, issues related to multiplatform applications are explored. Second section explains about educational gaming for traffic safety, alongside the mobile game developed, the technologies chosen and the game implementation. Finally, the evaluation process is described, where the performance of the educational game is tested on the target platforms and the results are shown.