The project will empower school teachers with an innovative GBL method relying on a new-defined item—i.e., Educational Tabletop Escape Rooms (ETERs)—to enhance learning on sustainability and curricular subjects. In detail, it will produce 1 online course and 1 handbook on GBL with ETERs, and 5 ready-to-use ETERs. Moreover, it will train 48 school teachers with ETERs, engage 1600+ students in learning with ETERs, and finally assess the efficacy of learning with ETERs in a research study.