Where do you use the passwords?
Viewing post in The Things We Lost In The Flood comments
If the billboard says 'write,' you tab to type a message.
If you get a billboard that says 'Password:[something],' then you have to take 100 parcels/discs to the red door to open it. It takes you to a platform with a computer and the password is used to extinguish all other life in your universe (every player has their own - the rain/bottles are interdimensional)