Since it has not been mentioned yet: Discworld Noir is easily one of the best adventure games of all time. And apart from it being very difficult to get runnin

Since it has not been mentioned yet: Discworld Noir is easily one of the best adventure games of all time. And apart from it being very difficult to get running due to heavy reliance on platform specific hacks and DRM of the time, once you get past that it holds remarkably well (meaning in terms of graphics and music etc) for its age.