Always remain subtle.
Never compromise the brotherhood.
The three tenants of the Assassin's Creed. It's really a wonderful game. Few other titles offer such immersive graphics together with such amazing gameplay. The goal of a game has always been to provide a challenge, yet not so difficult that it stops anyone from playing it. In today's world, that translates to being able to make your in-game avatars perform the fanciest of actions with just a few keystrokes. Assassin's Creed does that very well.
As the name suggests, you play as a member in an order of assassins(pronounced many different ways, including the original word hashashin). Your enemies are the Knights Templar, and a large purpose of your existence is to keep bringing new blood into the ranks of city guards. Mostly by killing people on duty.
Naturally, you have to go around killing certain people. Your targets, usually big figures and rich guys. After they have become acquainted with your hidden wrist-blade, you have to make your escape. In my opinion, this is the best part of the game.
Thanks to this feature they call Free Running, it appears as if you have been endowed with the abilities of a Jedi Knight. You can scale walls with relative ease, and run and jump from rooftop to rooftop, over rickety beams and gazebos. All the while, guards on the ground yell at you while trying to follow you. The chase ends when you have broken the line of sight of any pursuing guards, and found a place to hide. It seems as if the guards are really underpaid, or just extremely lazy, since they'll just give up the hunt moments after losing sight of you.
One of my favourite things to do would probably be pushing an archer off his post, onto the ground below. After which, chaos ensues and I can slip into the citadels without detection.
The controls are a little different from what I am used to, mainly because the game was ported from the Xbox. Still, I think it works well.

-Joe