As a non-medical professional, reacting to an emergency situation where life is at stake is not an easy task: knowing the minimum procedure to react to such a situation is a question that most people just cannot answer. This paper proposes a serious game using a simple picture-based navigation which provides a training tool for common people. This serious game wants above all that everyone can fully know the four priorities of action: (1) keep calm, (2) evaluate the situation, (3) identify the dangers, and (4), call for help.For practical purposes, the domain of early childhood has been selected to train educators for five t ypical m ajor a ccidents they will probably encounter with children. Two of these accidents were fully developed, parameterized, and tested. This paper focuses are: first, on the medical and social needs, demonstrating how important first-witness reactions are in an emergency scene; second, on how different domain experts and professionals were brought together; third, on how the software was developed based on an educator-centered design. Result in terms of image-based interface and user tests show that a application without fantastic graphics and special effects can have a real impact: potentially, an impact on people's lives.