This article presents a design kit for Role Learning Games (RLG) as multiplayer and multi-role learning games. They use some concepts of Role-Playing Games (RPG). Indeed, RPG are growing in education, but teachers rarely have the tools to design one themselves. Based on a RLG model, a design kit was created: the RLG Kit. Following Design-Based Research, we submitted the kit to teachers through three qualitative experiments to assess its usability. We wanted to know if users understood how to use each element of the kit, if they succeeded in creating a RLG scenario with the kit and thus to improve it.