Hack your way across Europe and North Africa, helped along (?) by The Commodore. Not for the weak-hearted... but beautiful, even if you're looking at it from a puddle of goo on the ground.
A pretty slick 3-level scenario based in a city... pay phones work just like they do in real life (which means not all that often). New monsters, lots of new textures, great gameplay... try it, you'll like it.