This document describes an educational role-playing game and simulation about sustainable land management on the island of Ouessant, France. It discusses the background of the project, including understanding past vegetation dynamics and different stakeholders' perspectives. It also introduces the Cormas simulation platform and details on developing the "Mottes-Piquet" role-playing game, including addressing limits of the prior prototype and constraints for an interactive game at Oceanopolis. The presentation concludes with a live demonstration of the role-playing game.