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The Old Safe is a puzzle in Professor Layton and the Diabolical Box.

Puzzle

US Version

Find the four-number code that opens the safe. You can use the numbers zero through five in your answer, but each number can be used only once. The small lights next to each row of numbers are the key to finding the code, as they tell you how much in common that row has with the final code. Each white light indicates a number that matches one in the code but is in different place within the sequence. An orange light indicates a number that is in the code and in its correct spot. Tap the numbers at the bottom to enter the code.

UK Version

Find the four-digit code that opens the safe. You can use the digits 0 to 5 in your answer, but each digit can only be used once. The small lights next to each row of digits are the key to finding the code, as they tell you how much in common that row has with the code. A white light indicates a digit that is in the code but in a different place in the sequence. An orange light indicates a digit that is in the code and in the correct spot. Touch the digits at the bottom of the screen to change them, then touch Submit when you have your answer.

Hints




Click a Tab to reveal the Hint.

US Version

Start by figuring out which numbers belong in the code, regardless of order.

UK Version

Start by working out which digits belong in the code, regardless of order.

US Version

You may have already noticed, but every number in the code is in the very top row of numbers. Two of the numbers in 4150 are even in the correct spot relative to where they should be in the code.

UK Version

You may have already noticed, but every digit in the code is in the very top row of digits. Two of the digits in 4150 are even in the right place.

US Version

Take a look at the third row of numbers.

You can see that two numbers math ones in the code and are in the correct position. Since you know the code uses 4, 1, 5, and 0, you can assume the 0 and 1 from this row are part of the code and in their appropriate spots.

Now just figure out where 4 and 5 go.

UK Version

Take a look at the third row of digits.

You can see that two digits match ones in the and are in the correct position. Since you know the code uses 4, 1, 5 and 0, you can assume the 0 and 1 from this row are part of the code and in the right place.

Now work out where 4 and 5 go.


Solution

Incorrect

Too bad!

Give the puzzle another try.

Correct

That's right!

US Version

The code is 0154. Some people solve this by entering numbers haphazardly until they stumble upon the solution, but it's much more fun to think your way to the answer.

UK Version

The code is 0154. You could solve this by entering numbers haphazardly until you stumble upon the solution, but it's much more fun to think your way to the answer.

DB081S

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

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