Heart Castle is one of the locations found in Heart no Kuni no Alice, Clover no Kuni no Alice, Joker no Kuni no Alice, Omochabako no Kuni no Alice, and Twin World. The castle is always located in the top left of each country it is shown to be in. In all games it is in, Vivaldi, Ace, Peter, and the King live there.

Heart Castle is the governing territory of the Country of Hearts, with Vivaldi in charge.

In Heart no Kuni no Alice, Vivalid holds a Heart Castle ball for one of her mandatory events.

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