Assassin's Creed Black Flag Resynced remakes most of the original pirate game, specifically all the swashbuckling parts starring Edward Kenway, but not all of the 2013 original. Ubisoft explains that's because it's just focusing on the game's story this time around.
The original Assassin's Creed Black Flag came out in an era where countless blockbuster single-player-focused games would ship with a multiplayer offering packed in (see Tomb Raider, Uncharted 3), and multiplayer-heavy games still regularly came with a slimmer solo campaign. Black Flag was no exception, and featured a suite of pretty cool PvP modes that put a different spin on the series' classic stealth.
