The Battlefield Royale is a place on Grand Kai's Planet in Dragon Ball Z: Buu's Fury. It is where the Cave of the Ancients resides.
Overview
The Battlefield Royale is a grueling maze full of strong fighters. According to Olibu, many of the fighters there have been training for hundreds, even thousands of years. Goku goes there when Olibu tells him that it is an incredible fighting challenge after he arrived on the Grand Kai's planet with King Kai. Olibu confronts Goku there, in front of the Cave of the Ancients, after taking a shortcut. Once defeated, Olibu leads Goku to the Cave of the Ancients.