Number Loop - Slitherlink

Number loop is a puzzle that connects lines.
The rules are simple, but there is a lot of fun.
You can suspend, so you can proceed steadily.
Since the correct answer rate of other users also comes out, please challenge the problem of your favorite difficulty.

◆ Number loop is such a game
It is a pencil puzzle that connects lines based on numbers.
It is a puzzle that has been loved for many years, which has been around for nearly 30 years.
Puzzles of the same rule are called with various names such as "Slitherlink" "On the Dot" "Number Line" "Loop Course Puzzle" "Logical Circuit" "Enclosure Puzzle".

◆ Convenient checking function installed
It is very convenient when you do not know where you made a mistake, with answer checking function attached.
You will be at a loss when you notice the mistake on the brinkish front, but if you have this function you can tell by mistake where you made a mistake.
Although it is convenient, please use it carefully because it will significantly lower the difficulty of the problem.

◆ Rule of Number Loop
It is a purposeful puzzle to connect a line to make one loop.
So, it is called a loop.
Since it is one ring, it is not good to branch a line or to make multiple sums.

In addition, the number written on the square indicates the number of sides through which the line passes.
If it is 0, no line is drawn on one side as well.
If it is 2, two lines will be drawn on the side.

Even if you solve it with a sense, you can solve it logically, but there is only one answer.
When pulling the mistaken line, it is hard to find which line was wrong or a line, so we recommend to solve it logically as much as possible.

◆ Brief description of how to solve
The answer is always set to be one.
Let's fill in as much as possible from the fixed line.
Also, X can be placed where you know that you can not draw a line.
Since the position of the line is often determined based on X, let 's put as much as possible.
Especially as the squares become larger, we will proceed to place lines and X alternately.

In this puzzle, there is a strategy of saying "Here is the definite position of the line if this number arrangement is said" which is often called "theorem".
You can find out by yourself while solving a puzzle, but what you use easily and frequently is listed below.
Please use it as a hint of capture.

◆ Recommended for those who
I like puzzle games.
I want to think slowly and solve problems.
I want to enjoy an impatient game that requires reflexes.
I want to learn how to solve Slitherlink.