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Hang Castle is a large, mysterious and spooky area filled with many towers under a large moon in the background. The stone hallways outside of the towers are filled with torches, and sometimes contain dull-colored plants to the sides. Some tall, round platforms contain notable illumination marks on the surface resembling spiders. Throughout the level, the castle seems to have red banners with an eye embedded on them. Mist seems to also be present in some parts of the stage. Towards the end of the level, there is a large tower crafted in the image of Dr. Eggman on one side and Neo Metal Sonic on the other.
Hang Castle is the first of two stages, the other being Mystic Mansion, that contain the mysterious orb switch which seemingly flips the stage upside down. The player must tread around the floating platforms cautiously, especially if they are used to carry the player across bottomless pits. Some of the floating platforms that move up and down will not move until the player stands on them.
Because of their unique Light Dash ability, Team Sonic and Team Dark can find long trails of Rings in this level. Also, as Team Sonic and Team Dark, they will need to run vertically down along the surface of a tall tower, avoiding obstacles and gaining points via Rainbow Rings in the process. The player cannot backtrack in this section.
The stage introduces stone walls that can be destroyed with Power Formation attacks which conceal Item Boxes, switches, or passageways necessary for the player to proceed. Also new to this stage are the torches, which can be used to score points by extinguishing the flames, though if the flame is touched the player will take damage. Some torches are simply flames formed on platforms and in midair, though with the latter they serve to create some sort of an invisible pathway the player can walk on.
This is the only stage in Sonic Heroes to have two musical tracks: one for when the castle is right-side up, and another one for when it's upside down.
If Team Sonic and Team Dark are played and start at the beginning of the level, and the player pauses at the gap at the beginning, the buildings are shown to be stretched. A character falling is shown to be a never-ending void if somewhat hacked.
Hacking reveals that the orb switches don't actually invert the level, but warp the characters to a different part of the level made to appear upside-down.
If Team Sonic and Team Dark are played during this level and reach the end, the player can see that the moon has a face with a creepy smile while going towards the roof of the castle.
The moon that looms large over the stage is actually that of Earth's moon and Jupiter's moon Ganymede fused together. This gives it the creepy face-like lunar maria.