I am not a native English speaker, so forgive me for possible spelling mistakes.
I heard the fountain of purity hidden in the final basement could unlock CGs, but cannot confirm. You may try on your own.
The game will automatically switch timelines after the character has dealt with a certain number of ghosts.
Wolf Hour has become easier in this game, but you cannot interact with items or ghosts during this period, so please be aware of what you missed during this period.
Chelsea
Take the candle in the basement. Go to the leftside room on 7th floor. Check the wall (middle-left), choose to light up the candle.
To exorcise: Take the knife in the laundry room on 1st floor. In the leftside room on 7th floor, use the knife to peel off the wallpaper.
L2 Ghost
At the beginning, sleep on the bed.
To exorcise: View news.
L3 Mannequin
Take the ring on the bookshelf in room 12 (lower left) on 6th floor. Go to room 7 (lower right) on 3rd floor, open the door with password 1969. (you can get it in Melissa’s timenline) Directly ring the bell.
To exorcise: Before ringing the bell, turn around the two mirrors next to it.
L4 Hands of the Dead
Take the elevator key on the bedside table in room 5 (upper right) on 3rd floor. Enter the elevator, insert the key into the control panel, choose 3rd floor.
To exorcise: Get the Pentagram bookmark in the attic (go through the rightside room) on 7th floor. Enter the elevator, first draw the Pentagram on the door, then insert the key.
R1 Old cinema
Get the film in the attic (go through the rightside room) on 7th floor. Go to room 10 (upper left) on 6th floor, directly turn on the projector.
To exorcise: Get the sulfuric acid on the table in the restaurant on 4th floor. In room 10, first use the acid to destroy the curtain, then turn on the projector.
R2 Jackal
Go to room 3 (lower right) on 2nd floor, open the wardrobe.
To exorcise: Go to room 1 (upper right) on 2nd floor, check the hint behind the wardrobe. Then check the wall at the foot of the bed. Follow the hint to get the cross. In room 3, Insert the cross in the wardrobe door.
R3 Living flower
Go to the greenhouse on 5th floor, stand in the middle (between two bookshelves) for a while and the tentacle plant will appear. Tame it.
To exorcise: Get the herbicide in the electrical room on 5th floor. In the greenhouse, Use it on the tentacle plant.
R4 Jack-in-the-box
Go to room 9 (upper right) on 6th floor, open the scare box on the desk.
To exorcise: Take the spring on the bed in room 4 (lower left), 2nd floor. In room 9, insert the spring into the scare box.
You can take the scissors on the reception desk in the doorway on 1st floor.
Melissa
Press the elevator call button three times in the hall on 3rd floor. (please stand on the button side, do not enter the elevator)
To exorcise: In the electrical room on 5th floor, pull down the first and third levers, then pull down the switch to reset the elevator system. After that, press the elevator call button three times in the hall on 3rd floor.
L2 Old cinema
In room 10 (upper left) on 6th floor, directly turn on the projector.
To exorcise: First turn on the spotlight on the wall, then turn on the projector.
L3 Jackal
In room 3 (lower right) on 2nd floor, check the guide behind the wardrobe, follow the guide to open the door on the room floor, then wait for the monster to come out.
To exorcise: After you exorcise the tentacle in the basement, it will leave a jar of acid. Take the acid. In room 3, once you open the door, immediately interact with it again to pour the acid.
L4 Living flower
Go to the greenhouse on 5th floor. Water the tentacle plants.
To exorcise: Get the plant growth inhibitor in the washroom on 2nd floor. Use it to kill the tentacle plants.
R1 Tentacle
In the basement, pour pink liquid on the lab bench.
To exorcise: Ignite the burner.
R2 Jack-in-the-box
In room 9 (upper right) on 6th floor, shake the scare box.
To exorcise: In room 9, close the shutter, then get the scare box handle from the bookshelf inside. Inserting the handle into the scare box.
R3 Ghost
In room 8 (lower left) on 3rd floor, stand by the bed for a while, then the ghost will appear. Interact with him to befriend.
To exorcise: Use the vacuum cleaner next to him to clean the room.
R4 Mannequin
In room 7 (lower right) on 3rd floor, directly turn the handle of the sewing machine on the table.
To exorcise: In room 7, open the password box in the room middle with 20-30-5 to get the buttons. Insert the buttons into the mannequin’s eyes. Open both shutters in the room. Then turn the handle of the sewing machine on the table.
Extra events
After dealing with all the ghosts, you’ll automatically teleport to the basement. The hotel owner will ask you to get the key for him. Just follow the blue light on the wall and you’ll easily find it.
If Melissa lost control to the puppeteer, you can rescue her in a room pointed out by the tentacle.
Side story Melissa and the puppeteer:
In room 7 (lower right) on 3rd floor, you first encounter the puppeteer. In room 12 (lower left) on 6th floor, meet him again. Then you’ll be taken to the secret chamber. Exit the room, go to the leftmost room with many mannequins. If you are caught, you will lose control to the puppeteer. (I recommend losing, because you can make up for it in the last maze) If you go down, you’ll enter the room with the key on the wall. If you further go down you’ll escape. If you take the key and go back, you can open the locked door in the hallway and see the Easter egg of Jack & Lilith. (You still need to escape in the same way)
L1
Chelsea: During the Wolf Hour, got caught by the rag man for 3 times to unlock this scene.
It seems he only appear in the greenhouse or on 2nd/3rd/6th floors’ corridor or in guest rooms. You can check if there’s red light around Chelsea. If yes, then wait for him in this room. If not, you may switch to another room. The more times you get caught, the more complete the scene would be.
L2
Chelsea: If Melissa have exorcised the tentacle/living plant but Chelsea have not. Some holes on the wall/tentacle traps will appear in some rooms. Get caught by them to unlock this scene. The more times you get caught, the more complete the scene would be.
L3
Chelsea: This is actually an ending. If you fail to deal with all the ghosts until the time’s up, you’ll get this ending. In room 6 (upper left) on 3rd floor, you can sleep for 2 times to skip the game time.
L4
Chelsea: Take the window key in the hall on 7th floor. Look out from the guest room windows on 2nd floor. Through one of them you’ll get caught by the alien to unlock the scene.
R1
Chelsea: Read the note on the table in room 5 (upper right) on 3rd floor. Go to the washroom on 2nd floor, walk around in front of the mirror until the ghost appear. Talk to him. Then go to the restaurant on 4th floor, take his skull. Then go back to him and he will reward you.
R2
Chelsea: In room 8 (lower left) on 3rd floor, get the bath gel. Take a bath in any room on the sixth floor and add the bath gel to unlock the scene.
R3
Melissa: In room 6 (upper left) on 3rd floor, listen to the radio for 3 times to unlock the scene.
R4
Melissa: This is actually an ending. If you lose control to the puppeteer, and you finish the game without taming all the ghosts, and you don’t save Melissa in the basement maze, you’ll get this ending.
Endings
Finish the game with Chelsea exorcising all the ghosts but Melissa tamed some.
L2
Finish the game with Melissa exorcising all the ghosts but Chelsea tamed some.
L3
Chelsea: During the Wolf Hour, Chelsea got caught by the Rag Man for 3 times.
L4
Finish the game with both girls taming all the ghosts.
R1
Chelsea: In the basement maze, you will find spider webs in the corner of the screen on some maps. Approach the webs for a while and the spider will catch you. Repeat several times to get this ending.
P.S. it is weird but you won’t get caught in the map where you can directly see the huge spider.
R2
Finish the game with both girls exorcising all the ghosts.
R3
Finish the game with both girls exorcising some of the ghosts while taming some.
R4
Chelsea: Caught by the hole on the wall trap for 4 times. Keep in mind you can only achieve this without exorcising/taming the tentacle as Chelsea.
Thanks to Memento Mori for their excellent guide; all credit belongs to their effort. If this guide helps you, please support and rate it here. Enjoy the game.
This is the most complete guide I’ve come across thanks for posting this.