The Cave to Another World is the first Bonus Dungeon in Dragon Quest VII. Each section of the cave appears like other dungeons that are explored in the game. It can be unlocked after beating the game. At the end of the dungeon, the party can challenge the Almighty if they wish, and He will give them one reward for each time He is defeated.
The fragments required to access the Cave are received from:
King Maximo after turning in 100 mini medals (85 in the 3DS version)
The castle town of Estard in the epilogue. The party must check the well to receive the fragment. In the PSX version, the party has to stash away the fragment in a treasure chest near the cliff by Dermot the Hermit's house. In the 3DS version, the fragment will appear in the party's inventory if the player saved after the ending.
Sections from previous dungeons are incorporated in the following order: