I agree that a case study is suitable for your topic, especially since you want an in-depth understanding of how educational games work in a real classroom. Your use of ...
I agree that a case study is suitable for your topic, especially since you want an in-depth understanding of how educational games work in a real classroom. Your use of multiple data sources (observations, interviews, materials) also shows good triangulation, which strengthens the study. However, as you mentioned, limited generalizability is a concern. One possible solution is to provide thick description of the context so that other researchers can judge whether the findings are transferable to similar settings.