The Unterzee has multiple islands, with each island having its own storylet quests. To progress in the quests, the player has to provide an item or complete a skill check. To acquire the items, the player usually is not able to acquire them at that island and must go to different islands or defeat sea beasts. The skill check takes one of the player's five skills (Hearts, Iron, Pages, Mirrors, and Veils) and based on the value of the skill gives the player a chance to pass the test. Passing the tests often will give the player items, while failing them will occasionally harm the player and will often prevent the player from trying again for a period of time.