The Sugar Rush castle towers over most of the kingdom. To access its gates, one must travel across an extremely long, cookie wafer bridge, which leads to the hillside on which the castle resides. Its exterior has a primarily white color palette; its theming being based on sugar coating. The entrance is a large, stain-glassed door with spherical designs based on different candies such as peppermint. The entrance is heavily guarded by Oreo guardsmen, who also operate within the castle's walls. The "welcome mat" of the castle's main entrance also acts as a trap door into the Fungeon.
The castle's interior is mostly colored in pink (salmon, according to King Candy) walls, furniture, and draperies—matching Vanellope's princess gown. A long, velvet carpet stretches to the throne, which doubles as a parking space for the Royal Racer kart.
Places of interest
- Throne Room: King Candy's base of operation. It is here that the king would normally carry out the governing of the kingdom, with Sour Bill always by his side. The throne room has a secret elevator beneath its curtains that leads to the lowest level of the game: the code.
- Code Room: A forbidden chamber hidden beneath the castle, the code is described as the "sweet lifeblood" of the game. Those who have access to it, have the power to manipulate and control the world of Sugar Rush and its inhabitants however they please. The code is guarded by a vaulted door, which can only be bypassed using the Konami Code.
- Fungeon: The fungeon was King Candy's dungeon prison. Vanellope and Felix were briefly held in the fungeon, until Ralph rescued them. The windows of Felix's cell are made of Pocky sticks and have beds made of strawberry wafers. Vanellope's fungeon cell appears to be decorated with a circus-themed mural, with crying clowns and animals on the walls saying quotes like, "Someone's been naughty!" and, "You are a bad girl!" Her cell is also equipped with "glitch-proof" chains that prevent from glitching out of the fungeon.
- The castle was based on Mary Blair's design of the castle featured in Cinderella.
- The castle's sugar-coated exterior is a reference to King Candy's personality, which is covered in sugar coating.
- The entrance of the castle resembles the entrance to the Wicked Witch of the West's domain in The Wizard of Oz, emphasized by the "March of the Oreos" gag in the film.
- Ralph makes an observation that the castle's interior is pink, which King Candy tries to downplay as salmon. Pink is a color traditionally associated with girls; thus it alludes to the fact that King Candy is an impostor, and that the castle actually belongs to a princess (later revealed to be Vanellope).