There is provided a scheme of communicating reward data from a first application running on a data processing device (100) to a second application on the data processing device (100) for use by the second application. The method comprises the first application obtaining a reward value in response to a user of the first application completing a predetermined task in the first application. In response to a request from the user to claim a reward, the first application generates and transmits: an instruction to place the second application into an interactive state; and reward data, which is generated on the basis of the reward value, for use by the second application in the interactive state. The passing of the reward value from the first application to the second application occurs within the data processing device (100), with no communication between the data processing device (100) and the backend server (200) via the Internet (400) taking place.