After you obtain the master key from the hacker try losing it in a way which prevents you retrieving it Dropping it into the pit beside the alter works well Now if you go back to the Terminal Room and ask hacker for it again hell give it back to you This works in 203870506 the earliest version
When you encounter the rats in the steam tunnels try escaping them by climbing on the coaxial cables above you Eventually the rats will swarm up and start to bite you making you fall But if you try letting go of the cables before they do this youll get two descriptions of your death one saying that you go of the cables and the other saying that the rats bit you and made you fall