The stage has two main platforms; a larger, flat ground on the left, and a smaller, raised piece of ground on the right with a large gap in between.
Occasionally, the Dark Emperor appears in the background, then later comes to the stage, or retreats back to the background. While he is off the stage, the Dark Emperor will occasionally provide an upgrade or downgrade to all characters wearing a specific color of costume (shown in pulsating lines at the top of the upper screen); when this happens, a notification appears in the bottom screen detailing who was affected and how. Occasionally, he will fly into the foreground, damaging those he touches. After taking a certain amount of damage, he becomes defeated and flies back into the background, awarding the player who defeated him with a temporary stat boost. At times he can also make one of the two platforms temporarily sink into the abyss.
A caged prince or princess Mii is positioned above the left platform. This cage is solid: it can be stood on and characters can rebound on its bottom and sides when launched. Attacking the cage makes it swing it around, and when hit enough times the cage breaks, launching the Mii off into the distance with a pseudo-star K.O. The cage later reappears, containing the same Mii. Releasing the Mii in this manner will make the Dark Emperor leave the battle earlier than usual.
The Omega form of this stage has a single platform with walls. No Dark Emperor nor caged Mii appear.
The stage is based on the final area in Find Mii II / StreetPass Quest II, known as the Castle of Darkness.
At the beginning of the game, the player's Mii, who is the ruler of a kingdom, is captured. He is imprisoned in the Castle of Darkness, guarded by the Dark Lord or Dark Emperor (depending on the quest). In the normal quest of Find Mii II / StreetPass Quest II, the final boss is the Dark Lord, who is fought at Castle of Darkness - Sky Tower; in the Secret Quest of Find Mii II / StreetPass Quest II, the final boss is the Dark Emperor, who is fought at Castle of Darkness - Roof. The platform layout of the stage is identical to how the Castle of Darkness appears on the Find Mii II / StreetPass Quest II world map.
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