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 children.