RKP3 is a really good CK game. It has a pretty nice engine and a thing new to Commander Keen games: The background and even the foreground obstacles "move" like 3D objects. (I mean if you look out of your car when moving, something that is far slides behind slower than something in front). I kept playing this game for a looong time, but it is incredibly hard at some places, and so I couldn't finish it. Even now I don't know what the ending looks like. Another interesting thing is that the title, Attack of the Cones, definately reminds me to a movie called somewhat similar, and to tell the truth I don't like that movie as well as its predecessors :p But RKP3 is different. A worth download.