ABOUT KARAKASA

Hello, I’m
Karakasa.

Alongside my work as an active football referee, I create every question by hand to make the Laws of the Game easier to learn.

Karakasa

JFA-registered Class 2 Football RefereeCreator of Soccer Laws Dojo

I am an active football referee. I develop and run Soccer Laws Dojo, and I create the questions published on its website and app as well as the refereeing explanations in Judge DB. When I referee, I pay close attention to the moments that feel difficult to understand or decide, then turn those moments into something people can learn from.

My work as a referee

I write about the Laws of the Game from the perspective of someone who makes decisions on the pitch.

Qualification: JFA-registered Class 2 Football Referee
How I started refereeing: I gained refereeing experience through a university sports club.
Matches I currently officiate: High-school-age and adult matches
Publishing and development: I develop and run Soccer Laws Dojo, including the website and the Soccer Laws Dojo mobile app.

Why I created Soccer Laws Dojo

As a referee, I am reminded every day how important it is to deepen my understanding of the Laws of the Game. After a difficult decision, I often revisit the Laws once the match is over and only then fully understand what happened.

At the same time, there were few places where I could study the Laws consistently. Referee renewal courses and training sessions happen only a few times a year. Unlike bookkeeping or language learning, I could find almost no service that let me answer a few questions each day and build my understanding over time. Reading material was available, but there was no easy way to discover what I did not yet understand. That was a challenge I faced as a referee, too.

I thought that a place where people could try questions casually and learn from their mistakes would help both me and others working towards the same goal. That idea became Soccer Laws Dojo.

Later, I added Judge DB, which examines decisions from real matches through the Laws of the Game. Moving between the ideas learned in a question and seeing how they apply in an actual match makes the Laws feel much more relevant.

What I create

Both are informed by the experience I gain through refereeing real matches.

5,000+Laws of the Game questions

Multiple-choice, fill-in-the-blank and case-study questions focus on situations and conditions that can be difficult in matches and referee qualification exams.

Explore the app →

93Judge DB explanations

Each explanation takes a decision from a real match and shows which part of the Laws applies and how the incident can be understood.

Explore Judge DB →

5Languages available

Japanese, English, German, French and Spanish, because the Laws of the Game are shared around the world.

Read in English →

Every question is made by hand

From the wording and answer choices to the correct answer and explanation, I follow this process for every question.

Read the Laws and choose one learning point
I read the IFAB and JFA Laws of the Game and identify one condition that can be difficult in an exam or match.
Turn it into a situation you can picture
To make the question more than a memory exercise, I frame it around something that could happen on the pitch or a decision a referee might face.
Write the answer choices and explanation
I create choices and an explanation so that learners can check not only the correct answer, but also why it is correct.
Answer it again and review it
I check that the question reads naturally, has only one correct answer and lets learners trace the reasoning from the explanation.

What matters when I write questions

Focus on the difficult decisions

I turn conditions that can still cause uncertainty, even when they seem familiar, into concrete match situations.

Go beyond right or wrong

Each explanation helps learners revisit the reasoning behind the decision, not just check the answer.

Make steady learning manageable

The aim is to make it easy to complete one question at a time and build understanding, even in a short study session.

I’ll keep building from here

You can share feedback on the questions or suggest a topic you would like to study on X.

View on X

Hello, I’mKarakasa.