The Extremes Deutsch Oberstufe course is a set 5,000 words at a highly advanced level, introducing word meanings of low frequency of use and occurrence which might be difficult even for native speakers themselves. Mastering this set of vocabulary items allows the learners to understand highly complex and abstract statements and texts on any given topic, as well as to formulate their own opinions in a fluent manner, yet preserving various meaning differences. These skills correspond with the C2 level of the Council of Europe scale.