Hellfire: Unlocking the Computer Room Doors
In the "Hellfire" scenario, you will come to a point where you find yourself in a security room and needing to unlock both the B5F Computer Room and the B4F Shutter Door. While you could go tracking down the keycards, which can be a timely and dangerous process, you can enter these passcodes into the computer.
To unlock the B5F Computer Room, enter either "A375," "J126" or "C582." Because the code changes with each playthrough, you may have to try all three.
To unlock the B4F Shutter Door, like the computer room door, you have to enter either "B482," "D580" or "A194."
While in the computer room you can also gain access to B2F and the rooftop by entering codes. For the rooftop the code is "0930" every time. For access to B2F, you have to enter either "3555," "5315" or "8211."
Decisions, Decisions: Free Health
In the "Decisions, Decisions" scenario, there is a chance to get some valuable healing items from George without having to give up anything. In order to get these healing items, you have to select a party that does not have George in it. Once you have the group selected get in the elevator and go to the Basement 2nd Floor (B2F). Once you arrive you should find George injured and laying on the ground. Talk to him and he will give you, for free, a Large Recovery Medicine item and two Large Anti-Virus items.
Decisions, Decisions: General Manager's Room
Again in "Decisions, Decisions," there comes a point where you will find yourself in the General Manager's Room with a puzzle in front of you. The puzzle is the least of your problems as three zombies will follow you into the room and can do some serious harm to you and your group, especially on the 'Very Hard' difficulty. To rid yourself of this undead nuisance without firing a single shot, as soon as the zombies enter the room run to the door that leads into the Student Affairs Room. Once in the room, chill out for a couple of moments until the zombies begin banging on the door. Once they start banging, walk to the door you just walked through and re-enter the General Manager's Room. The zombies will be gone and you will have ample time to solve the puzzle.
Oh, and just to help you out with that puzzle: Easy̵2;03:25, Normal̵2;10:05, Hard̵2;07:40, Very Hard̵2;02:50. They key is to see which larger numbers the smaller numbers are making.