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After all other guests have gone to their room, go up the stairs.
Use the first door on the left, Otto’s, and enter. Ask him everything you can to learn more about him and his work. After the conversation, leave the room and use the fourth door from the left to enter your own room. Use the nightstand to open the drawer and find a NOTE inside (1/1). Look at the note in your inventory to learn the phone number of Miggs. Leave your room and go up the stairs on the right.
Open the double doors on the left and enter the Travel Room. The door on the left of the fireplace leads to a storage room and inside you’ll find a box in front of the bookshelf. Use the box to take a pair of SCISSORS out (2/3). Use the door again to leave and exit the Travel Room through the double doors. Use the door opposite the stairs and walk up the stairs to the door on the right. Use the door to find Simon on the other side.
Talk to him and ask about all the others and learn about the padlock on the door (1/4). Walk south and down the stairs. In the hall at the Travel Room go down the stairs again and use the first door on the left to talk to Otto again. Ask him about the lock pick and he’ll suggest to call someone else (1/5). Look at the notepad (top of screen) to see Percy’s number and use the phone from your inventory to call that number.
Talk to Percy and ask him to do some research on the history of the house (1/6). Use the phone again and this time call the number from the note you found in the drawer: Miggs. Talk to him and ask about the house and the ghosts (2/8). Ask him about the locked room and he’ll tell you about the key (1/9). Leave the room and go down the stairs on the left.
In the book case, left side, third shelf from the top hold the Harlequin Novels. Use the row to take the “Key to her Heart” book (3/12) and discover it’s not a book but a box with a small lock. Use the scissors on the box to unlock it and reveal an old rusty KEY (3/15). Go all the way up to the fourth floor and use the key on the padlock. Then there’s a scream from downstairs (5/20).
Leave your room and use the door to the right of yours to talk to Alice about herself (1/21). Ask about all the others and when you ask about Mme. Tilly’s nightmare, you discuss the secret room (1/22). Leave the room and return to Otto in the room on the far left. Talk to him about Mme. Tilly’s nightmare and he’ll tell you he needs more evidence (1/23). Leave the room and go down the stairs on the left. Use the rug to discover a trapdoor underneath (2/25).Use your phone and call Miggs to ask him about the trapdoor (1/26).
Walk all the stairs to the fourth floor and Simon will tell you about the missing key. Go down the stairs twice and use the door on the far right to talk to Alice about the room upstairs (1/27). After the conversation you hear noises from Simon’s room. Leave the room and use third door from the left to enter Simon’s room. Enter the bathroom on the right where all the blood is. Inside you’ll find Simon and he’ll explain all.
Outside Mme. Tilly will talk to you and leave for the Travel Room. Use the door on the left and talk to Otto. Tell him the meeting is about to start (1/28). Leave the room and use the door on the far right and tell Alice the same (1/29). Leave the room and go up the stairs to the Travel Room. Enter the room and the meeting starts. After the meeting, choose to hang out with Simon and Alice (5/34).
After the conversation with Mme. Tilly, leave the room and enter the room next to you to talk to Alice. Ask her about last night (1/35) and the seance (1/36). She’ll tell you about the toilet. Use the door of the bathroom to take a look and use the toilet to watch closer. Use the top of the toilet to take the lid off and use the mechanism to find the stopper jammed. Look below the stopper to find the layer of grime.
Leave the toilet, the bathroom and the room of Alice and use the third door from the left to talk to Simon. Ask him about the seance (1/37). Use the door to the bathroom and use the cabinet above the sink to find the TOILET CLEANER (2/39). Leave the bathroom and exit Simon’s room on the south. Use the door on the far right to return to Alice and use the door of the toilet again to enter. Look closer at the toilet and take the top off.
Use the toilet cleaner on the water and after some time the grime dissolves (2/41). Flush the toilet and find the KEY under the stopper. Take it (3/44) and leave Alice’s room. Walk down the stairs on the left and use the key on the trapdoor (2/46). Use the open trapdoor to go downstairs. Use the cabinet on the left to take the CANDLE and the book of MATCHES out (4/50).
Use your phone to call Percy and ask him for your personal items and ask him for the ring (1/51). Use the ladder to leave the basement and you’ll hear a knock. It’s Percy with the RING (2/53). Go up the stairs twice to the Travel Room and enter the room. Talk to Mme. Tilly and ask her about the items, the spirits and the other guests (4/57). Show her the ring (2/59).
In your inventory use the book of matches to light the candle (2/61) and give the candle to Mme. Tilly (2/63). Use the pair of scissors on yourself to fill the empty jar with your blood (2/65). Give the jar to Mme. Tilly (2/67) and the seance can start. When it’s your turn to present your personal item, show the ring to Mme. Tilly again (6/73).
Look at the mirror to get the message. Leave the bathroom and the room and in the hall talk to Simon. Use the door on the far right to talk to Alice and ask about Simon (1/74) and the new door and the mirror. Leave the room and enter the room on the far left. Talk to Otto and ask about the research (1/75). Leave the room and go up the stairs on the right. Open the door to the fourth floor and climb more stairs to the locked room on the fourth floor. Talk to Simon about the mirror and the extra door. Suggest an exploration (1/76).
When Simon walks to the right and doesn’t return, walk to the right as well until you find… no Simon. Walk back to the left to discover that the door is gone. Walk back to the right and the door will appear on that side. Use the door to enter a huge room with another door as well. Use the door on the right and you’ll be in a hallway with four doors.
Use the second door from the left. That looks familiar. Use the door again to return to the huge hall. Use the door on the right and you’ll be in a hallway with four doors. Use the fourth door from the left to find Alice in the hallway (3/79). You’ll talk to Alice and Otto about Simon missing and decide to see to get into the room on the fourth floor.
Use the door on the left to return to Otto’s room and inside talk to Alice. Ask about the ghost (1/80) and Simon (1/81). Leave the room and enter your own room, second door from the right. Percy will call you and tell you about the windows (3/84). Use your own window to see if it opens and it sure does (2/86). Use the windowsill to climb out of the window (3/89).
Take a piece of the DRAIN PIPE (3/92) and use the window to climb back inside. Use the door on the left to leave the room and go up the stairs on the right. Open the door to the stairs to the fourth floor and open the door at the top of the stairs to reach the fourth floor. Use the drain pipe on the padlock to smash it open (4/96).
Look at and use the odd marks on the wall and do the same with the rope. Not much happens here. Leave the room and go down the stairs twice. Use the door on the far left to talk to Alice and Otto. Tell them about the top floor room and you decide to all have a look there (5/101). Then Otto tells about the summoning and the portal.
The summoning works and the ghost appears. Then Otto has to open the portal. The ghosts tries to stop Otto and while he’s choking, pull the rope on the right. The ghost will be distracted bu the noise of the bell and you can hit the ghost with the drain pipe and send it through the portal (6/107).
Game source: A copy of the game was found here  on the internet.