The Devil's Castle is a quest in Spirit Stones. Once per twenty-four hour period, it may be entered for free. Any subsequent visits will require the expenditure of a Devil's Tower Ticket. At the beginning, one of three difficulty levels (Easy, Normal, and Expert) is selected. Once started, the Quest continues until the Party runs out of hit points or when all twelve floors are completed. Each floor consists of 2-5 stages, with the last one usually being a single powerful Enemy. If any hit points are lost by the end of a floor, some or all will be recovered at the start of the next floor. The completion of a floor may result in a chest being dropped. The frequency of these drops and the value of their contents are based on the difficulty level.