Selection of Puzzle
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四角に切れのルールと解き方・解くコツなどは こちらを参照してください。

How to play Shikaku.
Click on the button of the problem you want to play in the table below. Then the problem window will open. The problem window is divided into a problem board and a control part.
Click (tap) on any cell of the rectangle you want to enclose on the problem board and drag it to the position of the diagonal cell and the rectangle will be displayed temporarily. When you finish dragging, the rectangle will be drawn on the board. The cursor moves to the last cell.
If you draw a rectangle so that it overlaps the already drawn rectangle, the previously drawn overlapping rectangle will be deleted and a new rectangle will be drawn.
If you click a cell on the board, if the cell is included in a rectangle, the rectangle will be deleted and the cursor will be displayed on that cell.
If you click the button in the center of the arrow of the control part and drag it to the arrow cell as it is, the rectangle that is temporarily displayed on the board is enlarged by one cell in the direction of the arrow. If you drag it to the original center button and drag it to the arrow cell again, the square temporarily displayed on the board will be enlarged by one cell in the direction of the arrow. When you release the button and finish dragging, a rectangle will be drawn on the board. Please note that if you drag to a place other than the arrow button and the center button, a square will be formed at that point.
It is not recommended that you draw a rectangle with the control part unless you are using a big problem and one cell is small. It is more comfortable to input on the board.
If you press the undo button, you can reverse the steps up to that point one by one, but when you move the cursor, it cannot be reproduced because it is not recorded.
Press the redo button to return to the state before undo.
When the try button is pressed, the mode becomes the try mode and the area around the try button becomes orange. It is effective to draw a rectangle on a trial and see what happens. During try mode, only the procedure entered during try mode can be undoed and redoed.
If you press the try button during try mode, You can select whether to return to the state before try mode and continue in normal mode, or to continue with the procedure entered in try mode as normal mode input.
Input in try mode is distinguished by orange input.
Press the check button to check if the answer is correct. If program find a mistake in one of the important items and find a mistake, program will not look beyond that.After correcting the answer, press the check button again to check. If the answer is correct, you will return to the puzzle selection screen. If program confirm the answer, the steps up to that point will be discarded.
Press and hold the check button to display the correct answer.
By pressing the setting button of the gear mark, you can set the language, screen color, size of the control part, etc.
Pressing the small i information button will display information on the current problem.
Click the +/- button on the control part to increase / decrease the size of the problem cell.
When the number of cells is large or the size of cell is too large, it protrudes from the board of the problem, some will not be displayed. You can move the displayed part by dragging on the scroll pad.
You can start over by pressing the retry button.
Press the quit button to exit. At this time, the history of the procedure up to that point is saved.

About history
On this puzzle page, a history of the steps you have taken to solve each problem, a history of whether you have already solved the problem, and other settings are also stored in your browser.For this reason, if you block cookies on this site with your browser, not only will your history not be saved, but it may not work properly.Before playing, please set to allow cookies to be saved and read. (Normally allowed.)
Depending on the browser, the capacity to store history etc. is not so large. Therefore, if you leave too much history, it will run out of space and may cause problems.
Please do the following to keep no extra history. When you solve a puzzle, be sure to press the check button to make sure it is correct. If the program determines that the answer is correct, the procedure up to that point will not be recorded in the history, but if you quit without checking any correct answer, the history up to that point will be saved.
If you try to solve it but it's difficult to give up in the middle, if you give up and try again from the beginning with the retry button, the history will not remain if you quit immediately. If you want to solve a difficult problem again later, you can quit in the middle and save the history so that you can solve it from the next time.
The history of solving each puzzle is deleted 90 days after the last update. Please be careful if you intend to continue.
If something is wrong, try deleting the history of puzzle steps that have been partially solved. (quit immediately after retry.) If you delete the history of the browser, you can completely delete the history, but the status of which puzzle you solved and the various settings will be lost.
This site uses javascript / HTML webstorage and canvas functions, but may not be supported by older browsers.
If you use the browser's synchronization function such as chrome, even if you play with different devices (pc and smartphone etc.), the history etc. will be synchronized, so you can solve the continuation solved with pc with your smartphone.
We use webstorage, but we do not send personal information to the server.
About list display
The table below lists the questions that are currently being issued.Press the button at the right end of the list to go to the screen where you can play the puzzle. There are two buttons to play on a vertically long board and a horizontally long board when the problem is that the number of cells is different.There is no difference in the problem whether it is portrait or landscape, and the history of the procedure is the same, so you can solve it halfway vertically with your smartphone and continue with the pc horizontally.
Click (tap) the tab to select the puzzle above, only that puzzle will be displayed. If you select all puzzles, all puzzles will be displayed.
If you click the heading of the issued date in the list, the questions will be sorted from the oldest questions to the newest questions.Click the heading of the issued date again to display in reverse order.
Similarly, if you click on difficulty, size, or status, it will be sorted in ascending order for each item, and if you click again, it will be sorted in reverse order.The status is in order of unopen,opened,finished.