2006: Dwarf Fortress
It is important, when contemplating Dwarf Fortress, to realise a couple of things.Firstly, and most obviously, the game is clearly some sort of work of art. The exact nature of the art is a bit difficult to pin down - certainly isn't an exercise in graphics and the plot is inconsistent between playthroughs - but nevertheless.The second thing to observe is it appears to be a life's work. A lifetime has not actually passed, but still there is a singleminded dedication here that is unusual.Thirdly, it is impossible for this sort of art to be a true lifetimes work because computers havn't been powerful enough to do this sort of thing for the full 50 years it takes to dedicate a life to one thing. Furthermore, not enough people have been exposed to computers yet.If humanity survives to 2121, there are going to be some amazing games. Gamemakers like Tarn, possible multiple generations of gamemakers, polishing these things will have some remarkable outcomes. I am glad to be around now at the birth of computing, but it is all too easy to envy the people who will be young in the 22nd century.