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このパズルはパズル雑誌「ニコリ」では数独と呼ばれ、一般にはナンプレと呼ばれているパズルです。
波及効果のルールと解き方・解くコツなどは こちらを参照してください。

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This puzzle is called Sudoku by Nikoli and is commonly called NumberPlace.

How to play Sudoku.
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.
The problem numbers are indicated by slightly larger black numbers on the board. (Sometimes there is no question number.) The cell where is no question number is answer cell, the answer number is displayed in gray. Click (tap) the answer cell on the board to display the cursor position mark. The cursor position can also be moved using the arrow buttons on the control part.
You can enter the answer number in the box at the cursor position using the number buttons on the control part.Numeric buttons in the control section are displayed in gray if the maximum number is 9. For questions where the maximum number is up to 16, it will be displayed up to 16. Numbers that are not the problem numbers of cells in the same group as the current cursor position, numbers that are not determined by other cells, and numbers that can be used at the cursor position less than the number of cells are displayed in black.
Pressing the memo button on the control part switches to memo mode, where you can enter candidate numbers as memos in cells where no answer has been entered. For questions up to 16, the display is a mark instead of a number.. In memo mode, the size of the characters on the number buttons is displayed small, the numbers entered in the memo at the cursor position are displayed in black, and the numbers not entered are displayed in gray. Press the memo button again to cancel memo mode.
If you press the undo button, you can reverse the steps up to that point one by one, but when you just move the cursor, the memo mode status is not recorded and cannot be reproduced.
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.
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.