You should only play at expert difficulty level in order to get all the game has to offer. People’s appearance is closer to one of medieval rather than victorian era. Often you can find torches and magical lights rather than bulbs. There are few elements of this like steam engines in basements and electricity produced by them but world is perceived like usual fantasy. Despite common opinion presenting Thief as steampunk icon, I wouldn’t say so. Barely animated but very impressive cut scenes between the levels tell the player about the world, its traditions and the balance of power. Perfectly articulated phrases of Garrett help to understand cynical nature of thieving artist. Heart-rending groans of undead deprive of comfort. Rustles and sough with some nervous music make great ambient. Significant role in creating the atmosphere is played by multimedia. I haven’t experienced such a strong emotions from playing a game since my early childhood. For example Haunted Cathedral mission was so repugnant I had to take pause for a couple of days before getting back to the game. In some places you can feel strong psychological distress. Level-designers made an extraordinary job to create right atmosphere. On many levels you won’t be allowed to use sword at all because good thief shouldn’t leave bloody traces. Two or more enemies at the time almost guarantee death. Every opponent have a chance to kill thief alone. Besides, Garrett is not meat-grinding action hero like Duke Nukem who attacks without any doubt. Thief is scarier than many horror games with hordes of ugly mutants and lots of gore because unknown fears lurking around in shadows keep in suspense every second.
When the protagonist himself says “creepy” you’d better believe. Almost a month took me to finish the game and I will remember it for long time. Earlier I had the post with my memories of old computers where also told about difficulties with getting Thief: The Dark Project run properly.