1 � You begin here after the train crash.
You'll find all the items from the train here (those that you dropped and those that you didn't pick up).
2 � Passageway in the sewers - it leads to the main hall (M2,3).
3 � Main hall - it has two levels.
There's a typewriter on the lower level.
There's a statue with a scale on the upper level - puzzle. Solving it unlocks access to the basement (M3,1).
4 � Room with a document and a Crank Handle. The crows will attack after you pick up the handle.
5 � Conference room. You'll find a document and a typewriter here.
Later in the game you'll solve a puzzle here - disk from (M2,22) is needed.
6 � There are zombies in this corridor.
Monkeys appear here later in the game.
7 � This room contains a map of the facility, microfilm A and an elevator which can be operated after taking a crank handle from (M2,4).
Later in the game you must use a lighter here to ignite a lamp next to a closed door.
8 � This room can be visited for the first time after using the elevator in (M2,7). Insects can be found here.
Later in the game you solve the clock puzzle here - an iron needle from (M2,18) is needed.
9 � Courtyard with a fountain and medical supplies. It's guarded by crows.
10 � A huge room where you collect a Facility Key from the cage and engage in a battle with the Centurion boss.
There are stairs here leading to the lower level - (M2,11).
11 � Corridor which connects the large room from floor 3F (M2,10) with the main hall (M2,3).
12 � Room with insects, a grenade launcher and a white statue.
Later in the game you can use a key from the basement (M3,13) to open a locked door.
13 � Dining room - zombies can be found here.
14 � Kitchen - you can access it using a key from the large room (M2,10).
Lighter fluid can be found here.
15 � Corridor. Left path leads to the basement (M3,6) and you can use it after solving the puzzle in (M3,4).
The right path leads to a new room.
16 � Room with zombies, a new Shotgun and a black statue.
There's a ladder here leading to the balconies (M2,17).
17 � Balconies with zombies and herbs. You visit this area for the first time by using a ladder in a room in (M2,16).
Monkeys appear here later in the game.
18 � Room with a document and an iron needle. You can visit if after obtaining a key in (M2,10).
19 � You can visit the room after solving the clock puzzle in (M2,8). Microfilm B is here.
20 � Corridor - leech zombie appears here later on.
21 � Bathroom filled with supplies
22 � Room with zombies and a projector unlocked after completing the clock puzzle in (M2,8). You need microfilm A from (M2,7) and microfilm B from (M2,19).
23 � Corridor with zombies unlocked after completing the puzzle in the conference room (M2,5).
Monkeys appear here later in the game.
24 � Room with patients beds, supplies and a file.
Later in the game you can obtain Green Chemical here while playing as Rebecca.
25 � Room with the chessboard puzzle. The reward for completing it is the Black Wing.
26 � Library - it can be unlocked using Billy's lighter. Angel wings can be found here.
27 � Corridor guarded by a leech zombie.
28 � Room with a leech zombie and a Vise handle.
29 � Bar with a piano. You can collect a battery here from a secret stash (use Billy to play the piano).
30 � Corridor. Leech zombie appears here later on.
31 � Room with zombies. Use a vise handle from (M2,28) to collect an Obedience Tablet.
32 � Room with various medical supplies.
33 � Area outside the building - it becomes accessible after solving the conference room puzzle (M2,5).
You can use a battery here from (M2,29) and then push a crate to gain access to the Discipline Tablet.
34 � Upper level of the observatory unlocked after completing the conference room puzzle - (M2,5).
35 � Lower level of the observatory.
In order to solve the puzzle you need the tablets from (M3,8), (M2,31) and (M2,33). This will unlock access to the laboratory.
36 � An elevator which can be used to reach the train wreck. Using the elevator becomes possible while visitng the factory and choosing Lv1 in (M5,10).