Clank!: Catacombs – Underworld, the second expansion to this deck-building, dungeon-crawling game, sees the thieves going deeper than ever before with special new tiles offering entry to a mysterious new realm.
Underworld expands upon the push-your-luck experience of Clank!: Catacombs, with even better treasures awaiting in the deepest areas...if you can escape!
—description from the publisher