I did give this five stars, but the sticky key problem seems to be getting progressively worse. So I had to lower this to four stars. Still a great game, but that one thing is nagging me, and getting me killed.
@Zorbak.
Actually, play Submachine 6: The Edge. The portals we see in most of the Subnet were created by humans, reverse engeneered from the original portals. At the end of Submachine 6, you get to see one of those original portals, and actually get to use it. The original portals did not even use the XYZ coordinates, it uses something called a connection pod.
 "AdVenture Capitalist"){kind=icon}
 "The Necronomicon"){kind=icon}
 "Decision"){kind=icon}
 "Omega Box"){kind=icon}
 "Submachine: 32 chambers"){kind=icon}