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Pass It On! is a puzzle in Professor Layton and the Diabolical Box.

Puzzle

US Version

Eight people are playing an unusual communication game. In this game, one person has to get a message across to seven other people.

It takes one minute to pass along the message, and each time the message is spoken, it can only have one recipient. Using these rules, what's the shortest amount of time in minutes for the message to pass to all seven other players?

UK Version

Eight people are playing a communication game. In this game, one player has to get their message across to seven other people.

It takes one minute to pass along the message, and each time the message is spoken, it can only have one recipient. Using these rules, what's the shortest amount of time require for the message to pass to all seven other players?

Hints




Click a Tab to reveal the Hint.

"Each time the message is spoken, it can only have one recipient."

What you need to remember here is that any one person can only spread the message to one other person at a time.

US Version

Try reading the problem again bearing in mind the above.

UK Version

Try reading the puzzle again while bearing the above in mind.

Every time a given person relays the message to another person, the number of people who know the message will increase by one.

One minute after the game starts, two people will know the message.

If each of those people then goes on to spread the message, by the end of the second minute, a total of four people will know the message.

US Version

Do you see where this is going?

UK Version

Can you see where this is going?


Solution

Incorrect

Too bad!

US Version

Did the wording of the puzzle throw you for a loop?

UK Version

Are you sure you're not being led astray by the wording of the puzzle?

Correct

Very nice!

If the original messenger spreads the word as shown above, the game can be completed in three minutes. During that time, the original messenger can tell three people the message, and the people who hear the message within the first two minutes can go on to become messengers themselves.

When an emergency arises, information networks structured in the above fashion can help get the word out fast.

DB021S

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

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