Multimedia systems, and in particular games, have special characteristics that make the process of obtaining system requirements very difficult. In most cases, an important work of codification is needed in order to obtain a prototype that can be analyzed by the customer and make requirements elicitation easier. This paper proposes a way of facilitating the process and obtaining a prototype in a short development time. Our proposal is based in the combined use of a well-known methodology for the construction of Multimedia Systems and Alice, and follows an Agent Oriented Software Engineering approach. The work introduces the process proposed as well as a tool that provides support for such process. Besides, a case study shows the application of the process and the tool to a simple example. From this example, the suitability of Agent Oriented Software Engineering approach and the proposed process for game prototype development is concluded.