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At the end of the hallway you arrive at a flight of metal stairs which ascend to a heavy, bronze-banded door. This sealed door appears to be a recent addition to the vessel; it is secured by a curious combination lock which you recognize to be Drakkarim in design.

The lock comprises three raised blocks, each of which is divided into four equal squares. In each square, except one, there is a number. You have encountered this type of lock before and are aware that by tapping the empty square a correct number of times, you will cause the lock to disengage and the door to open.

Consider the grid of numbers. When you think you have determined the missing number, turn to the entry that is the same number as your answer.⁹

If your answer is incorrect, or if you cannot solve this lock puzzle, turn to 139.