Interestingly, the Diabolical Cubus Sisters bear an uncanny resemblance to the Poe Sisters from the The Legend of Zelda: Ocarina of Time. If Link does not take the Heart Container that is left behind after the Sisters are defeated, he cannot get it from the chest again, since the Ghost Ship cannot be revisited. In this case, the Postman delivers it to Link instead; however, if Link also rejects the delivery, he cannot obtain the Heart Container for the rest of the game.