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The complete FlashBoss English course — in British English.
FlashBoss and all three English packs (Core, Pareto 1 and Pareto 2 — 3,000 words with spaced repetition and boss fights), together with the English Voice (F) DLC. With the voice installed, every English word and sentence is spoken — and spelled — in British English by default. Switchable any time in Preferences.
Please note: the English packs are a course for learners of English — they teach through the game's other language interfaces (German, Spanish, Japanese, Simplified Chinese, Russian) and are not playable in English alone.