System Shock

In this game you find yourself stuck on a space station with the insane computer Shodan. She have great plans for destroying earth and your goal is to stop her and flee from citadel station.

System Shock 2

Role-playing game that continue the story from System Shock. This time you wake up aboard the space ship Von Braun and find that everyone is dead and there are some problems with the computer system. Shodan is back and her goal includes earth gone and you dead :).

Thief 2 - The Metal Age

The story continues from Thief and Garret keeps moving around in the city, stealing things and getting mixed in the events of a new factions of the Hammers, the Mechanists. Always fun with servants that scream in fear when you emerge from the shadows :). Best level was Life of the Party.

Thief: The Dark Project

King of the sneak games. You play as Garret, a master thief in a dark steam punk world. You goal is to get rich by sneaking into and stealing as much loot as you can from peoples houses. This is best done by staying in the shadows, making as little sound as possible and disabling the guards and hiding their bodies. There are often many paths to use to reach a area in the game and one needs to spend some time watching the movements of guards before moving forward. One also have tools like lock picks and water arrows to snuff out torches. The story is told between the missions in movies and in books and texts found in the game. The order of the hammer and pagans battle each other and both try to use Garret as a pawn in their game and the mystical keepers act in the shadows and try to use anyone. Thief is one of the best sneak game, to bad they used the stealth technology in the advertising of the game also. Best levels was The Sword and Assassins levels. There are also a Thief Gold version that add three extra levels to the game.