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.
Bedrooms: Sixteen bedrooms, one per player. Each bedroom contains a bed, a closet, and a boogeyman.
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.
Chapel: A nondenominational religious chapel, complete with an altar and several benches. Pray to whichever god you wish in here.
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.
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...
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.
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.
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.
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.
Dining Hall: Multiple tables loaded with plates and utensils take up this room's space. A welcoming feast has been arranged.
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.