The objective of this paper is to restore the process of development and installation of a project called "Technocity" which aims to develop technology courses of French State Education among the young people from 15 to 18 years old, with a very special care for the girls. We develop a gameplay to build a new school guidance tools. We choose to create a dynamic approach with video game and shortly report on different technical job. After, we explore the impact and the reception of this tool in different classrooms by childrens and we compare with other product, like Food Force, from United Nation.