Princess Peach's Castle/Castle Attic

The Castle Attic is a new floor of Princess Peach's Castle found first by entering the Pipe to Another World, but then found by climbing up stairs in whatever floor is the top floor in the player's copy. It is a large yet short area with several rooms. It has several courses, as well as the hub for Challenge Mode. It appears to have several space-like textures on the walls, likely due to the the third floor having a sky-theme and this floor being the top floor.

Geography
The Castle Attic has several rooms. These include:

The Observatory
The Observatory is the main room of the Castle Attic, and is the starting room of the floor. It is a large circular room with a glass dome for the ceiling. Looking up into the central part of the glass dome leads to Seasonal Sanctuary.

The Dark Room
The Dark Room is a room found by punching a cracked wall in the observatory. It is a room with very little light with a hatch that leads to Deep Dark Dungeon, as well as a Bowser painting that leads to Bowser in the Airship Armada.

The Ravine
The Ravine is a room found by entering a door in the observatory. It is a room with a split in the middle of the floor. One side is made of black rock, and one is made of sand. The black rock part has the painting for Lava Lake, and the sand part has the painting for Ocean Oasis.

The Kitchen
The Kitchen is a room found by entering a door in the observatory. It is a room styled like a kitchen, With a Toad and a painting with Candy Canyon.

Challenge Hall
The Challenge Hall is a long hall found by entering a door in the observatory. It has several paintings of courses that have a new color applied to them depending on the challenge. The paintings are not enterable until the player reaches the end, and jumps into a pipe that switches the player to Challenge Mode.

Candy Canyon
Main Article: Candy Canyon Candu Canyon is a large pink canyon course found in the kitchen room. It has several objects based off of candies.

Lava Lake
Main Article: Lava Lake Lava Lake is a large lava course, similar to Lethal Lava Land.

Ocean Oasis
Main Article: Ocean Oasis

Ocean Oasis is a large water course, similar to Jolly Roger Bay.

Seasonal Sanctuary
Main Article: Seasonal Sanctuary

Seasonal Sanctuary is a large sky course set on a large floating island with 4 segments split into the 4 different seasons.

Deep Dark Dungeon
Main Article: Deep Dark Dungeon

Deep Dark Dungeon is a level similar to Hazy Maze Cave, but made of brick.

Bowser in the Airship Armada
Main Article: Bowser in the Airship Armada

Bowser in the Airship Armada is the Bowser level of the Castle Attic, set in the sky with several airships. It unlocks the cannon to the castle roof on the Castle Grounds when completed.

Challenge Mode
Main Article: Challenge Mode

Challenge Mode is a new mode found in the challenge hall. It adds several new stars that are repeats of normal missions in regular courses, but with new challenges added, such as stronger enemies.

Toad's Gift
This star is given by a Toad in the ravine room.

A Cake For Peach
This star is collected by helping the Toad in the kitchen bake a cake for Princess Peach. The Toad will give the player the star when the cake is baked. The cake is baked by picking up items and putting them onto a tray, and then picking the tray up and putting it into the oven.

Hidden In The Dark Room
This star is found somewhere in the dark room. This star is hard to find due to the low light in the dark room making it difficult to traverse the room.