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Box of Books is a puzzle in Professor Layton and the Diabolical Box.

## Puzzle

US Version

The box shown below has a height, width and depth of 30 inches. Within this box, you'd like to place as many books as possible. Each book is 20 inches wide by 20 inches long by 10 inches thick. How many books can you pack into this box?

Books can only be placed in the box in the closed position, but you can position each book however you like inside the box.

UK Version

The box shown below has a height, width and depth of 30 cm. You'd like to place as many books as possible in the box. Each book is 20 cm wide by 20 cm long by 10 cm thick. How many books can you pack into this box?

Books can only be placed in the box when they are closed, but you can position each book however you like inside the box.

## Hints

Click a Tab to reveal the Hint.

If all you had to do to solve this puzzle was count how many books you can stack in the box before it fills up, it wouldn't be much fun.

You'll need to think creatively and in three dimensions to solve this one.

US Version

The bottom of the box measures 30 inches by 30 inches. Each book is 20 inches by 20 inches, so you can really only fit in one if you place it flat. But if you do that, you'll be left with 10 inches on one side. Say, isn't that the exact same size as the thickness of one book?

UK Version

The bottom of the box measures 30 cm by 30 cm. Each book is 20 cm by 20 cm, so there is only space for one book at the bottom of the box.
But if you do that, you'll be left with 10 cm spare on both sides. Say, isn't that the exact same size as the thickness of one book?

Even if you place three books upright in the box and use two more to fill what gaps you can, you'll still have a good chunk of wasted space on your hands. Fitting the books together in a space-efficient way is of utmost importance in solving this puzzle.

## Solution

### Incorrect

Think in three dimensions to find the solution.

### Correct

Very nice!

US Version

If you arrange the books in the box as shown, you can cram a whopping six books into it!

UK Version

If you arrange the books in the box in the method shown, you can cram a whopping six books into it!

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