The field of rehabilitation has recently seen various experimentations with games using
interfaces that require physical activity. In order to establish the basis for developments and
experimentations with those interactive systems, we propose a rapid prototyping approach
using various commercial devices and open source software. To demonstrate this idea, we first
show how a simple free game can be adapted to specific needs − for training or use by disabled
people − by using different sensors and control modes. Similarly, we show that an open on-line
virtual world such as Second Life, although not perfect, offers sufficient conditions for quickly
building custom content and testing with usual interactive devices. When presented to these
prototyping possibilities, people from the target group (health care professionals, patients,
handicapped, families) are able to relate to their needs and to elaborate on the use of such
systems. In other words, the availability of a simple prototyping platform with free games and
new interfaces already opens the discussion on the design of original rehabilitation
applications.