World Abyss is a dungeon that can only be opened through a Secret Wonder Mail Mission. in Pokemon Mystery Dungeon: Explorers of Darkness and Pokemon Mystery Dungeon: Explorers of Time. It has 29 basement floors, the 30th being the place where the boss, an Altered Forme Giratina, lies, guarding the Rock Horn. It can also be accessible in Pokemon Mystery Dungeon: Explorers of Sky, by optaining Spinda's Café.

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