Great Hall: A huge central room that's full of several tables. At the northeast corner burns a large fireplace, big enough to fit a few people. A set of stairs leads down to the lower level, and this room has a notably higher ceiling than any other. This room has been reset.
Bedrooms: Sixteen bedrooms, one per player. Each bedroom contains a bed, a closet, and a boogeyman. Coffee's bedroom contains a secret passage to the Dungeon.
Closet: A small janitorial closet. Contains various cleaning supplies.

Bathroom: The usual - toilet, bathtub, and sink. This is the only bathroom in the entire castle. Please do not destroy it.
Hall of Statues: This particular hallway is lined one end to the other with all sorts of high-quality stone statues carved by Angie. Besides the obvious of Atua and Angie herself, there are plenty of other KG murderers past, such as MCD, The Other Monokuma, Colonel Sanders, and Tony the Tiger, just to name a few. At the east end is a hidden ladder to the roof.
Chapel: A nondenominational religious chapel, complete with an altar and several benches. Pray to whichever god you wish in here. This room has been reset.
Poolhouse: This room has been converted into a poolhouse, complete with potted plants and poolchairs, for all your desires to swim. People, bodies and items thrown into the moat will turn up in the pool at the start of the day. A secret passage at the bottom of the pool leads to the Gun Room, and the poolchairs have been chucked into the pool.

Beekeeper's Room: COVERED IN BEES. A room devoted to the care and raising of bees, and thus it's filled to the brim with bees, beehives, and beekeeping equipment. A set of stairs heads to the basement.
Indoor Garden: A lush garden covers the entirety of this room, plants growing everywhere except for a small path that leads between the doors and to the well. It's humid in there!
Well: An empty well that leads right down into the Dungeon. Without some sort of climbing or cushioning equipment, anyone who falls down this well will be knocked out and have their night end unceremoniously.
Library: Full of several fully-loaded bookcases. The bookcases are not designed to be moved, but they're not bolted or restrained. With enough force... One of them has toppled over.
Smithy: As the still-burning firepit here shows, this was the room where weapons were crafted. While there aren't any crafted weapons to be found, there's still hammer, tongs, and anvil, as well the general decor of a smithy. A set of stairs heads to the basement. There's a hole in the wall that leads to Angie's Room. The forge has been put out, and the anvil shoved down the stairs.

Angie's Room: Angie Yonaga's personal bedroom. It doubles as an impressively detailed shrine to Atua, as well as her personal art room, complete with all sorts of art supplies. This is where you can find Angie at the start of the game, and where she'll return to for each night's end if possible. This room has been reset.
Solarium: A massive glass window in the south wall and another in the ceiling mean there's plenty of sunlight to go around. Beyond that, just the basics in rest and relaxation, such as a couch, a coffee table, and a couple chairs. This room has been reset.
Gatehouse: The entranceway to the castle. The only items of note are the drawbridge sealing the entrance and the mechanisms to control it... which have been disabled. A statue of Colonel Sanders blocks the western exit.

Dining Hall: Multiple tables loaded with plates and utensils take up this room's space. A welcoming feast has been arranged, and swept off the table to be replaced with a demon shop.
Kitchen: Modernized! A fridge, a pantry, an oven... what you'd expect from a current-day kitchen. Still shows signs of its past, such as the roaring fireplace that's crackling in one wall of the room.
Freezer: A large walk-in freezer, currently full of frozen cuts of meat. The freezer door can be shut and locked from the outside only.

Moat: The entire castle is surrounded by a large moat, preventing anyone from leaving the castle for the duration of the game. Players, corpses, and objects that end up in the moat will be moved to the Poolhouse at the start of a day phase.

Dungeon: A bleak, dank cell with absolutely nothing in it except an unreachable hole in the ceiling that leads to the Indoor Garden. A secret passage leads from here to Coffee's bedroom, but it's been sealed via concrete.
Guardpost: A small room with a desk, designed for watching the dungeon. The dungeon door is currently unlocked.
Wine Cellar: Containing many fine vintages, there's all sorts of wine casks and crates. The door to the Guardpost is unblocked.

Throne Room: The central room of the basement. Largely empty outside of rugs and curtains, a massive throne sits at the north end of the room, and a staircase to the first floor runs up against the west wall.
Painting Gallery: Several beautiful works of art hang on these walls. There's nothing Atuan or murdery about these, they seem to have been added solely for aesthetic value. One of the paintings is missing, and another has a Mario 64 secret passage.
Armory: Full of suits of armor, as well as a large number of medieval weapons - swords, spears, axes, maces, flails...
Treasure Room: It's gold! A lot of valuable objects, such as gold, coins, and gems, can be found in this room. Not that it does you any good while stuck in here! This room has been reset.
Guardroom: Once where the King's Guard was stationed. There's a number of beds, a fireplace, a small dining table, a rack of knives, and a large book of some sort.
Music Hall: This room is full of several different musical instruments. Everything from strings to brass to keyboard. There's a staircase to the first floor, as well.

Gun Room: A room full of all sorts of guns, from handguns all the way up to a pair of cannons. A secret passage leads to the bottom of the Poolhouse pool. The room has been largely destroyed, and the opening has been partially resealed.

Gym: If you want to get a workout in, this is the place. It's equipped with all the exercise machine staples, as well as weights and tools. The gym is currently full of bees.
Furnace: The central heating system is located here. Powered by an old-style burning furnace, big enough to fit a person, it supplies heat to the entire castle.
Machinery Room: Contains the plumbing, electricity, and ventilation systems for the entire building. Be careful in here. There's also a staircase to the first floor.

Graveyard: A gloomy room, with graves running wall to wall. There's a string of unlabeled empty graves in the back. Coffee's body has been buried here, and Falconhoof's has been relocated here along with five heads.