This article's title is derived from Japanese
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... because it was never localized to English in official sources.
Central Circle  is the rendezvous room for all four  Kirbys in the game . It is the place where all the mirrors to the different places of the Kirby & The Amazing Mirror mirror world (above Dream Land's skies) are. The Central Circle is also the place where, after Dark Mind has been defeated, the Master ability rests on its pedestal below the Dimension Mirror, which was shattered by Dark Meta Knight. Hitting every big switch in the mirror world will earn the player a golden door, which leads into a room containing almost every Copy Ability in the game.
Theme - Rainbow Route
Rainbow Route is the nexus for all the mirror-doors, providing passage to every major location of the Mirror World. It shares the same cloud-filled surroundings of the level only accessible once at the beginning before the Kirby reach the Central Circle.
Nintendo website (Japan) ↑
Nintendo website (Japan)