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What Number? is a puzzle in Professor Layton and the Diabolical Box.

## Puzzle Edit

The numbers in the diagram below follow a certain rule. Some manipulation of adjacent numbers is used to derive the number centered below them. SO what number goes in the space marked with a question mark?

The rule at work here is absolute, so there are no exceptions.

## Hints Edit

Click a Tab to reveal the Hint.

Subtraction? No, that's not it.

You want to add.

## Solution Edit

### Correct Edit

That's right! The answer is 16.

The way to find the answer is to think of all the digits of the numbers in the diagram as single-digit integers. Then you just add them up. So, 160 and 144 would give you 1+6+0+1+4+4, which equals 16, the number below. That is the rule.

At first, it might seem that the rule is to take the absolute value of the difference between two adjacent numbers, but there's one place that won't work.

A big thanks to http://professorlayton2walkthrough.blogspot.com

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