## Rules and execise of Shikaku

"Shikaku" is an Nikoli original puzzle. You solve the puzzle by dividing the board into small boxes.

## Rules of Shikaku

- Divide the grid into rectangles.
- Each rectangle contains only one number.
- The number indicates how many cells are contained in the rectangle.

Sample

Solution

## Shikaku exercise

Let's solve this problem together.

Near the top left corner, the **3** looks like an easy clue. There is only room for 1x3 (with 3x1 the box would contain the **6**), so the result has to be 3x1, like here.

The bottom right **6** has to be a 3x2 box (2x3 and 1x6 are out), and there is only way to put it.

With the bottom right **6** in place, the **6** cell box above it has to be a 2x3.

Look at the **A** cell at the top right corner, thinking from the blank cells helps us here. The **A** cell can only be in the **3** box along the right half of the top.

The bottom left **6** is a 2x3 or 3x2 box. The blinking 2x2 cell will be a part of this **6** cell box, and we can mark the 2x2 block temporarily.

Now, using the temporarily set 2 x2 block, the result is simple, there is only one way to put the remaining boxes.

That's all, easy really, and now you are on your own.