Thief: The Dark Project is a single player stealth-based game made by Looking Glass Studios for Microsoft Windows PCs and published in 1998 by Eidos Interactive. The player takes the role of Garrett, a master thief plying his trade in an unnamed city. Garrett posesses great thieving and stealth skills, including an almost preternatural ability to hide in shadows. These skills come partly from his growing up as a street urchin and from his later education with the secret society known as The Keepers. The game follows Garrett as he clashes with the powerful and embarks on a journey into the City's strange history, stirring up more than he bargained for.

GGShinobi says

10/10 - Agree (2) Disagree

One of my all-time favorites. Really cool ninja-like stealth-sneaking!! It's a great challenge to try to sneak in and out without knocking anyone out or even get noticed.
The only drawback is the low AI when they discovered you. I hoped this to get fixed in the second part, but unfortunately they included more "features" instead. The second part is still good, but not as genius as this one! This is a MUST HAVE! PLUS: There are excellent "Gold Missions" available, mods from the community, some of those missions even excel the best of the missions which came shipped with the game!

And Garret is cool! :)