The <em>Art Nouveau Path</em>: Promoting Sustainability competences through a Mobile Augmented Reality Game

This paper presents a qualitative case study on the design, implementation, and validation of the Art Nouveau Path, a mobile augmented reality game developed to foster sustainability competences through engagement with [city]’s Art Nouveau built heritage. Grounded in the GreenComp framework and developed through a Design-Based Research approach, the game integrates location-based interaction, narrative storytelling, and multimodal Augmented Reality and multimedia content to activate key competences such as systems thinking, futures literacy, and sustainability-oriented action. The game was validated through a simulation-based training workshop with 30 in-service schoolteachers. A mixed-methods strategy was employed, combining structured questionnaires, open-ended reflections, and expert curricular review. Findings revealed strong emotional and motivational engagement, interdisciplinary relevance, and alignment with formal education goals. Teachers emphasized the game&#039;s capacity to connect local identity with global sustainability challenges through immersive and reflective experiences. Limitations included the need for enhanced pedagogical scaffolding, clearer integration into STEAM subjects, and broader accessibility across technological contexts. This study demonstrates that these games, when grounded in competence-based frameworks and inclusive design, can meaningfully support multimodal, situated learning for sustainability and offer valuable contributions to pedagogical innovation in education for sustainable development.