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To get full synchronization on the mission "Gatekeeper," you need to not take damage. Watch how it's done.
Keywords: Assassin's Creed: Brotherhood, Assassin's Creed: Brotherhood (Collector's Edition)
Tags: pc, full, creed, s, synchronization, brotherhood, guide, games, assassins-creed-brotherhood, gatekeeper, assassins-creed-brotherhood-collectors-edition, guide-walkthrough, walkthrough, xbox-360, ps3, assassin