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A haunted mansion with a twist, it was touched by the shrouded king, an inter-dimensional being of darkness, now the mansion acts as a pocket dimension with seemingly infinite rooms, and phases through time and space, having been photographed before it was technically created....
Feel free to throw in as many horror references as physically possible.

1. Foyer
2. Parlor
3. Anteroom
4. Wardrobe
5. Balcony
6. Study
7. Master Bedroom
8. Nursery'
9. Graveyard
10. Boneyard
11. Bathroom
12. Washroom
13. Conservatory
14. Storage
15. Kitchen
16. Dining Room
17. Ballroom
18. Laundry Room
19. Butler's Room
20. Hidden Room
21. Fortune Teller's Room
22. Mirror Room
23. Projection Room
24. Billiards Room
25. Courtyard
26. Rec Room
27. Nana's Room
28. Tea Room
29. Astral Room
30. Observatory
31. Twins' Room
32. Safari Room
33. Ceramics Studio
34. Armory
35. Clockwork Room
36. Telephone Room
37. Art Studio
38. Sitting Room
39. Guest Room
40. Sealed Room
41. Well
42. Secret Altar
43. Pipe Room
44. Cold Storage
45. Breaker Room
46. Cellar

Ken_Nt

1. Sauna
   
2. Indoor pool
   
3. Broom closet
   

Keystoneway

1. Sewing room
   
2. Library
   
3. Boiler room
   
4. Surgery room
   
5. Greenhouse
   
6. Pantry
   
7. Morgue
   
8. Exercise room
   
9. Room just for a certain kind of pet (Google 'tarantula room')
   
10. Game room
    
11. Cell
    
12. Woodshop
    
13. Swimming pool
    
14. Panic room
    
15. Padded cell
    
16. Torture chamber
    
17. Alchemy lab
    
18. Doll room
    
19. Elevator
    
20. Darkroom (like for developing photographs)
    
21. Mail room
    

Mythgirl

1. The lotion room: Dozens if glass shelves hold hundreds bottles of lotion. Footsteps are muffled against the leather floor. The walls are made of living skin hidden behind thin wood panels which fold out of the way like shutters.
   
2. The crime scene: A manikin lies motionless inside of a chalk outline. The decor is that of a seedy motel. Flies buzz lazily, crawling in and out of the the sink’s plumbing. Upon inspection a few strands of hair are found in the drain. If you pull them they slide out, slimy and damp, attached to a piece of scalp.
   
3. The powder donut: a room with opulent furnishings. Overstuffed chairs and sofa’s welcome visitors. If sat upon, they release a white cloud. Poison? Mold? Anthrax? Powdered sugar? Mites? Only time will tell the effects.
   
4. Abandoned room: all the furniture is covered in sheets. If lifted, nothing but dust is found under the cover.
   
5. Throne Room
   
6. Child’s bedroom
   
7. Child’s playroom
   
8. Tinkerer’s workshop
   
9. Model train room (or world equivalent)
   
10. Wood working room
    
11. Warehouse storeroom
    
12. Dangerous material storage
    
13. Pastry kitchen (completely separate from normal kitchen)
    
14. Smoke room (for curing meat)
    
15. Walk-in closet full of fancy costumes
    
16. Emergency supply room (full of water, fire suppressant, weapons, gas masks, and similar. Think prepper)
    
17. Room of magically useless curiosities
    
18. Statue room (full of statue figures)
    
19. Portrait room (full of portraits)
    
20. Sculpture room (not figures, more artistic)
    
21. Room of stone where everything is made of marble
    
22. Golden room (painted or real you decide)
    
23. Peacock room (like the famous irl one, beautiful room that was decorated to match the gorgeous painting of peacocks that spans the entirety of the wall and ceiling
    
24. Phoenix room (see peacock room, but Phoenix themed.)
    
25. Mirrored room
    
26. Cozy sitting room (fireplace and hot coco with marshmallows at the ready)
    
27. Window room (each window shows a completely different view)
    
28. Room filled with sand
    
29. Bathroom with dead woman in bathtub (the shining)
    

Edit: more stuff

1. Junk room
   
2. Tower room
   
3. Room of illusion (everyone inside appears to grow either horns or wings, mess with your party as you choose)
   
4. Pentagram room
   
5. Laboratory
   
6. Medical wing
   
7. Furnace room
   
8. Crematorium
   
9. Mausoleum
   
10. Embalming room
    
11. Padded cell
    
12. Suspiciously Empty room
    
13. Tavern
    
14. Classy bar (like a five star hotel)
    
15. Maid’s quarters
    
16. Swimming pool
    
17. Inhabited swimming pool
    
18. Locker room
    
19. Movie/play theater
    
20. Backstage
    
21. Loft
    
22. Crawl space
    
23. Call center
    
24. Scroll room
    
25. Interior of Pyramid
    
26. Exterior of pyramid inside larger room
    
27. Mummy’s Tomb
    
28. Automaton room
    
29. Trash compactor
    
30. Control room
    
31. Incubator room
    
32. Apothecary
    
33. Pharmacy
    
34. Waiting room
    
35. Stables
    
36. Gymnasium
    
37. Weight room
    
38. Sewing room
    
39. Glass cube room (think cabin in the woods)
    
40. Rustic Cabin room
    
41. Basement
    
42. Earthquake room (you feel an earthquake with inside it, but the rest of the house in undisturbed)
    
43. Room full of Fragile vases
    
44. Room full of cut Flowers
    
45. Room with one bloody handprint in the center of the floor
    
46. Room with bed (bed has rumpled sheets and is warm to the touch)
    
47. Room full of cats
    
48. Room with axe stuck in door
    
49. Room with typewriter and desk, papers with gibberish written on them are scattered over the floor
    
50. Freezer
    
51. Room with walls that are made of tree bark. Red sap oozes from it when touched. Smells of pine and mold. Mushrooms grow in patches
    
52. Room full of moldy dead rats (perhaps an later temporal space of the live rat room, may seem eerily familiar if they have encountered the living rat room first)
    
53. Living rat room: Room of food barrels, when disturbed, rats pour fourth (perhaps an earlier temporal space of the dead rat room, may seem eerily familiar if they have encountered the dead rat room first)
    
54. Cheese room
    

SuperNes
​

1. Masonry workshop
   
2. Museum
   
3. Reliquary
   
4. Barracks
   
5. Stables
   
6. Menagerie
   

Worldofideas

1. Attic
   
2. Boiler Room
   
3. Catacombs
   
4. Coach House
   
5. Darkroom (photography)
   
6. Furnace room
   
7. Mad Science Laboratory
   
8. Music Room
   
9. Root Cellar
   
10. Safe Room / Panic Room
    
11. Sub Basement
    
12. Summoning Room
    
13. Torture Chamber
    
14. Walk in Closet
    

Vinvladro

1. Torture Room
   
2. Wine cellar with wine press and some bloody rags scattered around the press
   
3. Brewery
   
4. Golem Workshop
   

More of my own ideas
178: Dinosaur Containment Units
179: Submarine Bay
180: Western Bank
181: Underground Temple
182: Puppet Theater
183: Agency
184: 80's Room
185: Criminal Hideout
186: Comic Fan's Room
187: Wizarding World Room
188: Space Station
189: Pirate Ship
190: DnD Room
191: Escape Room
192: Slasher's Collection
193: Art Cabin
194: Antidote Lab
195: Motel Rooms
196: Board Game Room
197: Wax Museum
198: Casino
199: Gore Fountain
200: Murderous Little Girl's Room
201: King's Crypt
202: Lurker's Room
203: Skeleton Band Room
204: Spider's Nest
205: Witch's Kitchen
206: Ghoul Stairs
207: Mad Scientist's Collection
208: Library of Spells
209: Gothic Dining Room
210: Fog Room
211: Potion Shop
212: Bone Web
213: Redneck's Shed
214: Indoor Beach
215: Hellish Labyrinth
216: Wedding Chapel
217: Ballet Stage
218: Fun House
219: Castle Gallery
220: Moon Pavilion
221: Psycho Cinema
222: Suburban Garden
223: Racist Club
224: Bloody Playroom
225: VRcade
226: Tribal Arts
227: Robotics Room
228: Funerary Storage
229: Slasher's Wardrobe
230: Ski Lounge
231: Vampire's Crypt
232: Seaside Knick Knack Shop
233: Tree Farm
234: Mutant Bunker
235: Demonic Book-Building Workshop
236: Alien Nest
237: Medieval Gallery
238: Scarecrow Shed
239: Cabin Cellar
240: Room in Tarps
241: Dog's Room
242: Puppet Workshop
243: Candy Shop
244: Post-Apocalyptic Room
245: Christmas Hall
246: Fleece Room
247: Playground
248: Giant Cake
249: Cannery
250: Room Under Construction
251: Moth Light
252: Fiendish Kennels
253: Sheep Tents
254: Alien Court
255: Railway
256: Bunny Bridge
257: Funeral Home
258: Squatter's Warehouse
259: Algae Pond
260: Civil War Battlefield
261: Dollhouse
262: Vampire Party Hall
263: Daughter's Crypt
264: Doghouse
265: Writer's Room
266: Cloning Lab
267: Electrocution Chamber
268: Corpse Pit
269: Boarded Room
270: Snake Island
271: Fossil Cave
272: Arctic Crater
273: Surgical Theater
274: Chemical Silo
275: Psychic Test Center
276: Spider Den
277: Old Aviary
278: Black Magic Strip Club
279: Witch's Warehouse
280: Ancient Egyptian Tomb
281: Pumpkin House
282: Giant Snow Globe
283: Deer Cult
284: Giant's Home
285: Snake Pit
286: Reanimation Lab
287: Reptilian City
288: Drinking Lodge
289: Twin Girls' Room
290: Ancient Altar
291: Asylum Cell Block
292: Vomit Covered Room
293: Time Machine
294: Shaman's Tent
295: Locker Room with steroids in one of the lockers
296: Room of Shadows
297: Elder Brain
298: Giant Board Game
299: Dark Shed
300: Revolutionary Exhibit
301: Limacology Labs
302: Broken Stables
303: Gator Shack
304: Ant's Nest
305: Apehouse
306: Rich Cat Lover's Room
307: Insect House
308: Tengu Shrine
309: Rodents Room
310: Inside a Genie's Lamp
311: Insect Study
312: Reptile Room
313: Parasite Storeroom
314: Athena's Shrine
315: Frog Library
316: Ruined Date
317: Gladiatorial Arena
318: Simulated Haunted House
319: Gorilla House
320: Death Cult
321: A laboratory that looks as though people left in a hurry...
322: A medical room that seems as though someone died here.
323: Japanese VHS Enthusiast's Apartment
324: Prison of the Deformed
325: Room of Stretchers
326: Oni's Hut
327: Mongolian Tents
328: Room of Cloaks
329: Gothic Party
330: Pteradactyl Enclosure
331: Carnivorous Greenhouse
332: Rabid Kennels
333: Space Hangar
334: Hatchet Shed
335: Indoor Swamp
336: Room of Smoke
337: Old Man's Room
338: Murdered Child's Room
339: Weaboo's Room
340: Snuff Studio
341: Warlord's Tent
342: Gamer's Parlor
343: Tentacle Pools
344: Toll Bridge
345: Headhunter's Camp
346: Sugar Mill
347: "Vaginal Torture" Room
348: Dermatology Room
349: Volcanic Room
350: Nile Tomb
351: Farmer's Children's' Room
352: Infant's Play Room
353: Room of Flames
354: Innsmouth Pawn
355: Rabbit Room
356: Maternity Ward
357: Steampunk Workshop
358: Minotaur's Labyrinth
359: Goth Girl's Room
360: Serkhet's Shrine
361: Irish Washerwoman's Room
362: Wild West Shooting Gallery
363: Medusa's Garden
364: Room of Decapitated Heads
365: Toxic Barrel Storeroom
366: Alien Specimens Room
367: Fishing Shack
368: Sushi Farm
369: Shark Bay
370: Alien Plant Cave
371: Butchery
372: Exterminator's Room
373: Elliot's Room
374: Magic Theater
375: Pirate Ship
376: Surgical Bay
377: Viking Long Ship
378: Hag's Barn
379: Vampire Garden
380: Enchantress' Room
381: Mutant Bug Arena
382: Clown Toyshop
383: Underworld Gate
384: Arctic Labs
385: Padded Cell (Someone escaped from it)
386: Gym Supplies
387: Virginial Garden
388: College Library
389: Sex Room filled with Plushies for some unknown reason...
390: Weed Farm
391: Security Office
392: Horror Movie Studio
393: Gadgets Lab
394: Office Cubicles
395: Break Room
396: Superstitious Woman's Room
397: Sexy Nurse's Office
398: Rest Stop
399: Room of Old Dolls
400: Reveren's Room
401: Parental Room
402: Sex Dungeon
403: Escape Room
404: Hoard
405: A.I. Room
406: Technovault
407: Staffroom
408: Ritual Room
409: Hellish Stripclub
410: Criminal's Apartment
411: Military Kennels
412: Femme Fatale's Room
413: Brine Reef
414: Decrepit Police Office
415: Skeletal Ballroom
416: Murder Circus
417: Wolf Den
418: Sulfuric Pit
419: Tribal Room with Snakes
420: Zombie Outpost
421: Law Firm
422: Decrepit Building
423: Creepy Old Orphanage
424: Vampiric Enforcer's Room
425: Sorority Room
426: Leprechaun's Cave
427: Death Row
428: Ghost Finder's Lab
429: Sunken Ruins
430: Faith Chapel
431: Convent
432: Vampire Hunter's Armory
433: Tickling Chamber
434: Fishing Boat Dock
435: Terror Chamber
436: Room of Coffins
437: Agentry
438: Widow's Bedroom
439: Sleepy Hollow Gallery
440: Prisoner's Row
441: Occultic Library
442: Sunken Spire
443: Well of Souls
444: Tomb of the Pharoah's
445: Blood Chamber
446: Pit of the Giant Wolf
447: Victorian Tea Room
448: Gothic Museum
449: Satanic Church
450: Cedar Cabin
451: Halloween Shop
452: Magic Show
453: Skeletal Garage
454: Asylum Common Room
455: Lynching Yard
456: Occultic Garden
457: Dark Post Office
458: Black Wedding
459: Holy Portrait Hall
460: Rl'yeh Gate
461: Victorian Labs
462: Room of Globes
463: Hunter's Parlor
464: Retro TV Room
465: Hall of Miniatures
466: Persian Lounge
467: Photo Freak's Room
468: Maze of Screens
469: Pit of Sharp Objects
470: Pencilhead's Room
471: Puzzle Room
472: Key Cabinet
473: Room of Wooden Cubes
474: Room of Jackets
475: The Giant Cuckoo Clock
476: Rotary Room
477: Room of Lights
478: Swimmin' Hole
479: Typewriter Room
480: Smoking Parlor
481: Cigar Storeroom
482: Second Drawing Room
483: Murder Mystery Parlor
484: Golden Throne
485: Case-File Storeroom
486: Evidence Storage
487: Room of Pulleys
488: Slideshow Theater
489: Cassette Room
490: Room of Newspapers
491: House of Matches
492: Room covered in Duct Tape
493: Room of Plug-Ins
494: Static
495: Relaxation Chamber
496: Lake of Rust
497: Room of Passwords
498: Fishing Pond
499: Detective's Office
500: Pamphlet Office