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This time, you have to solve Sudoku 3 times.

There are 3 difficulty levels and you have to solve it 3 times.

Even if you make a mistake in the middle, there are often cases where you have to start over from the beginning because you don't know if you made a mistake.

So I'm going to show you how to add one check feature as an option.

This post will be removed upon request from the stove side.

If you press F12 in Chrome, the developer tools will appear.

If you click Console, you can enter information at the bottom.

function checkSudoku5() { const board = getBoardValues();
if (isValidBoard(board)) { message.innerText = "Normal."; } else { message.innerText = "Error!"; }}
$(".code > center").append('<button type="button" onclick="checkSudoku5()" style="text-align:center;">Check</button>');

Copy and paste the above content and press Enter, and a check button will appear.

You can check if there are any current errors by clicking the check button.

However, this is not to check if there are any actual errors, but to check if there are any errors when entering the information based on the information entered so far.

That is! Even if there are no errors, there is a possibility that it is wrong, but it means that there are no duplicates at the time of the current check.

I made this with the intention of at least providing an intermediate check since it was too difficult.

If you request a stove, this post will be deleted.

Everyone, please try a little harder and get the coupon!

PS

It was inconvenient to have the message pop up in a window, so I made it appear as text above the check button.

I tried uploading it again because there was a line break error when pasting.

* Let's call the entire 9x9 Sudoku box a box, and arbitrarily call the 3x3 boxes inside it square blocks.

Let's call a row of 9 squares horizontally and vertically a block.

Sudoku is not difficult once you know the basic principles and get used to it.

I was really into Sudoku a long time ago, and now that I'm playing it, the methods I used to solve it are coming back to me vividly.

I don't remember all the methods, but I remembered a few, so I'll share them.

1. The numbers 1 to 9 must be placed in a 9-square block without any duplicates .

2. This rule also applies to horizontal and vertical blocks.

...

Nine 3x3 square blocks.

There are 18 blocks, each with 9 horizontal and 9 vertical blocks.

The first thing you should do is look around the entire Sudoku board.

Like scouting in an RTS game.

If you look closely, there are sections with more hints.

Of course, if we focus on these, it will be easily solved, right?

If you look at the red circles below, you can see that there are 3 or 4 blank spaces, which is less than other blocks.

Others have more than 5 blank spaces, which means there are fewer spaces to fill in and therefore more hints.

We need to figure out which number is empty here.

The leftmost red circle doesn't have 1, 2, 3, or 9.

The middle square is often easier to solve because there are hints on all sides.

There are three blank spaces in the vertical block in the very middle. Can you see that the numbers 3, 4, and 5 are blank?

Find 3, 4, 5 among the numbers around you.

Number 4 of them provide useful hints in various ways.

The red vertical block at the very bottom overlaps the yellow square block, right?

The red vertical block overlaps the yellow square block at the bottom, and there is already a 4 there.

So, that overlapping interval cannot contain 4.

The yellow line is the overlapping area of 4.

There must not be any other 4 within this overlapping area.

If you look at the red box again, it should contain 3, 4, and 5.

Except for the top section, the remaining sections overlap with the 4 sections of other sections.

So only the top one can have 4.

That is, it becomes like this.

Here's another way to solve it.

It should be used in conjunction with the above method rather than with other solutions.

If you look around the map, you will see that one of the two is more advantageous than the other.

In that case, each person can apply it.

As expected, we scan the board focusing on the central square block.

Here, we will first solve it focusing on the number 9.

Looking around the 9, I see a lot of hints.

If you follow the default overlapping area of 9,

You will find a non-overlapping area of 9 in the yellow square blocks.

Based on these results, we can see that 9 is confirmed in the upper left corner of the block one space below.

If you solve them one by one like this, the whole thing will be completed before you know it.

This is a different version.

As expected, there are many hints in number 9, so let's start from number 9.

As explained above

Just look at the overlapping area of each block and write down the numbers.

Before that, let's look at the middle blocks to see which blocks and numbers have the most hints.

The hint for 8 is simple and effective.

Find the simple and easy parts and solve them first.

Fill in the blanks.

By looking at other blocks, you will find overlapping areas and fill in the gaps.

This time, let's solve it focusing on the number 3.

After identifying the overlapping area, identify the valid section.

Once you solve just one, hints will follow, making the solution faster.

The basic outline of solving Sudoku is as follows.

It's been a few years since I've done it, so I'm a bit confused and remembering things as I go along, so I feel like I've talked nonsense.

If you do a quick Google search for a Sudoku guide, you'll find some easy-to-follow examples.

It's not difficult once you learn the solution, but if you get confused about the rules before that, it seems really difficult.

But the truth is, it's really simple.

After scouting the entire board and identifying the overlapping area,

If you start by solving easy and fast problems centered around numbers or blocks with lots of hints,

As the hints increase, it becomes easier to solve like a snowball.

Ugh... I missed the rhythm game coupon yesterday. ㅜㅜ

I thought it was the same event as the previous rhythm game with a lower difficulty level, so I thought it wouldn't give out coupons. ㅜㅜ

Anyway, this Sudoku is fun and anyone can try it, so I hope you give it a try.

There are also Sudoku games for steam and stoves, so you might want to check them out.

Although it is a game of numbers, it provides endless content that will make you lose track of time as you play.

STOVE90864742's record is 135 points!
I got 0 Flakes as a challenge reward.
I can't wake up from my egg..
Next time, try faster!

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