This game is a masterpiece, to put it simply. Every aspect has been fine tuned to a point of absurdity. The ambient noises and voice clips create a tense and exciting atmosphere rivaled only by other Thief games. The use of lighting combined with noise in stealth elements comes together to create a stealth system still not surpassed to this day. The learning curve is welcoming to newcomers in the series, but is not easy. The levels get more complex and exciting as the come progresses. The story is original, and is reaveled through gorgeus cutscenes and listening at doors. The voice of Garret only adds to the excitment. The world this game creates - an early rennaisance world with dashes of fantasy and steampunk (also automotons!) is the icing on the cake for this masterpiece. If you are looking for an amazing stealth and action game that isnt Deus Ex, skip Assasin Creed 10 million: this time theres aliens: revelations part 3, and plat Thief 2, the Metal Age. TLDR; This game is an all time great, do yourself a favor and buy it.
