First of all, I can say the story is always new and improved with new characters and memories. The game play is just fantastic, the addition of the Den-Defense and the Hookblade. I also like the new currency, as well as the bomb crafting. The graphics seem to improve from game to game. As in Revelation's case, these are very well optimised for PC(no console off-topic here). The sound is also good, glitchy sometimes for some people that can play it only on medium, and have lag. There are also some "invisible walls" that occur around the city. Updates may fix this Second, the multiplayer is different by it's new characters. It's all I can say about the multiplayer, haven't tried it on my own, just at a friend's. And the last one, the Altair memories. I can say some of Altair's life left me without words in the first game. As of new memories, I can understand him better. Some maybe won't understand him at all, because they haven't played the first game.
So, even after all these years, Ubisoft still knows how to make excellent games.
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