An excellent game that I would still play now and again if I still had a copy.
Too few of the truly enjoyable FPS games for the PC have been translated over to the console systems, and that's a disappointing thing at times.
I spent countless hours playing through Project I.G.I., having completed the game a couple of times, seeing if I could successfully complete one mission or another without being observed by guards or security systems, trying (frequently without success) to sweep through mission after mission without being forced to restart due to an unfortunate demise.
It would be nice to think that this particular FPS hasn't been forgotten.