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Beyond the archway, a passage leads to a pair of stout steel-sheathed doors. The lock that secures them is inlaid with a series of numbers and you immediately recognize that they are part of a combination lock. One number in the sequence is missing. By tapping the correct number upon the blank square, you will cause the lock to disengage.

Study the following sequence of numbers carefully. When you think you know what the missing number is, turn to the page that is identical to your answer.9

If you guess incorrectly, or if you cannot answer the puzzle, turn instead to 297.

[9] The section corresponding to the correct answer will have a footnote confirming that it is indeed correct.

Text copyright © 1991 Joe Dever.
Illustrations copyright © 1991 Brian Williams.