How Did Kid Buu Travel to Other World?

Kid Buu was able to enter the sacred world of the Kais in Dragon Ball Z, but this feat logically should not have been possible for the villain.

If Goku could basically teleport at will between earth and the other world at will at the end of Cell Saga, why didn't he just revive, train there from 9am till 5pm

How did Kid Buu move so quickly between planets, space, hell, and the afterlife? Does he know his own form of instant transmission or something? - Quora

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How Did Kid Buu Travel to Other World?

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