Descriptions of the rooms from the map
Elevator used to get to the treatment plant from the factory (M5,10).
A balcony - the game will play a short cut-scene.
Security room where the power grid puzzle needs to be solver. There are also a typewriter and a small eleavtor here. The elevator travels to (M6,4).
Room which you can explore after using an elevator (M6,3). You'll find zombies and supplies here.
Corridor - you will encounter a hunter during your first visit and zombies will appear here later on.
Recreation room. There are zombies and treatment plant map here.
The stairs lead to (M6,7).
You will first get here by using the stairs in (m6,6).
There's a forklift here which needs a battery. Using the forklift will give you a chance to collect a keycard.
You must solve the crates puzzle here, however it's possible only after rescuing Billy in (M6,10). Solving the puzzle is rewarded with a handle.
Stairs with the leeches. They lead to (M6,10) where you'll find Billy.
You will find Billy here and you can get to this room for the first time using the stairs in (M6,9).
Attention - a giant toad (lurker) may appear here.
You can unlock this room by collecting a handle from (M6,8).
There are zombies here and a ladder which leads to (M6,12).
Area which becomes accessible after using the ladder in (M6,11).
You'll find a document and a canister with red chemicals.
Corridor with two hunters.
Room with a file, supplies and a typewriter.
Stairs. The door at the end leads to (M6,16).
Balconies which you can access by using the stairs in (M6,15). Watch out for a new toad (lurker).
Room with zombies and a file. There's a console here (it requires a motherboard from (M6,19)) and an elevator which travels to (M6,18).
After inserting the motherboard Rebecca can use a gondola to get to (M6,20).
Room with a boss (Proto Tyrant) which you can access by using an elevator in (M6,17). Use a ladder after the fight. It leads to (M6,19).
Area which can be accessed by using a ladder in (M6,18).
A motherboard is here and it's needed in (M6,17).
Rebecca can get here by using a gondola in (M6,17).
There's a lever here and it lowers the water on the walkway near the dam.
Room with an insect, industrial water and blue chemicals.
The stairs lead to (M6,22).
Storage room - Rebecca can get here using the stairs (M6,21) and Billy using the door in (M6,24).
There's a battery here that's needed in (M6,7).
Passageway by the dam. You can use it after pulling a lever in (M6,20).
Attention - a new toad (lurker) will appear here.
Room with zombies and supplies. You can unlock a door to room (M6,22) from this side.
Corridor which leads to the queen leech's lair. You can unlock it by obtaining a keycard in (M6,7).
Area where you have your first battle with the queen leech. Use two keys after the battle to unlock room (M6,27).
Last room visited before the final battle. Collect supplies, save your progress and use a large platform.