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In The Witcher 3, navigating quests sequentially by region—starting with White Orchard, then Velen, Novigrad, and Skellige—preserves the narrative flow and prevents missing storyline-specific content [1.1, 1.2]. Optimal progression involves completing side quests before major, level-gated story quests, specifically finishing character-specific tasks like "The Last Wish" and "Brothers In Arms" before the "Isle of Mists" checkpoint [1.2]. You can read more about this on Reddit.
