Another amazing year.
Between Alpha Centauri, Age of Empires II, Heroes of Might and Magic III, Legacy of Kain: Soul Reaver, Jagged Alliance II, The Longest Journey, Homeworld, Outcast, Might and Magic VII and many others it is hard to pick one.
But one game really stood out for me that year, Planescape: Torment, for not many games ask you "What can change the nature of the man?".
Also, 1999 was the year that first Quantic Dream's game, Omikron: The Nomad Soul, released. While flawed in some ways, it was quite ahead of its time, and it's still one of my favourite games to this day. David Bowie is also always a plus for a game to have in its cast and to feature some of his songs.