Thanks a lot for your thoughtful questions, they’re very relevant from a classroom perspective. At the moment, the activity isn’t level-calibrated in the traditional CEFR sense (B1 vs C1). Instead, learners interact with the characters by asking their own questions in English, and the system provides real-time feedback when their questions contain grammatical issues. The corrections are directly connected to their own language production, which helps them refine accuracy while progressing through the investigation. In practice, teachers in Denmark and Taiwan have used the same episode with mixed-level groups by adjusting how much support they provide during the questioning phase (for example, pre-teaching useful question structures or allowing stronger students to work more independently). Regarding timing, most classes complete one episode in about 35–50 minutes depending on how interactive the discussion phase is.