Each of the game's nine central missions breaks down in a similar way: when Altair enters the district where your target lives, his knowledge of the area will be a complete blank - the map is fogged over, and there are no visible objectives. To unfog your map and reveal points of interest, you'll need to seek out and scale an assortment of "View Points," dizzyingly tall structures that range from relatively small watchtowers and minarets to gigantic, realistically detailed castles, cathedrals and lighthouses. Climbing to the top of one reveals the locations of the others in the area, as well as opening up access to a couple of side missions. The best part is that, when you're finished climbing, you can get down quickly via a vertigo-inducing swan dive into a conveniently placed haystack (which will automatically break Altair's fall from any height, anywhere).

Key to getting up there in the first place is the game's free running feature, which takes a little getting used to but is incredibly fun once you do. Rather than worrying about jumping over obstacles manually, you can just hold down two buttons while running and you'll automatically parkour over anything in your way, whether it's a crate, a wall or a series of tightropes. It feels a little like cheating, until you realize that it enables you to effortlessly get around in a hurry, which is especially useful when a bunch of guards are hot on your tail and you don't want to deal with any complex jumping puzzles.