I understand Kotlin 100 times! The ultimate learning quiz app for Kotlin learners.
Acquire programming knowledge while solving quizzes.

You can dramatically improve your Kotlin programming knowledge while learning in a quiz format.
It offers a wide range of problems from beginner to advanced and provides comprehensive coverage of important topics.

Detailed explanations are displayed when you answer correctly, so you can gain a deeper understanding.
In addition, repeated learning through quizzes can increase the retention of knowledge. Please help me with my eligibility.

A learning app that provides the fastest path towards mastering Kotlin programming.

★ It's completely free, so please feel free to try it.


· Four-choice question
・ ⚪︎ × problem


· 1 to 10 (difficult as the level increases)

The issue will be updated from time to time.

This application is in Japanese.

By repeatedly working to get all the questions correct, knowledge will be established.

In addition, it is assumed that this application will be used by the following people.


・Beginners and beginners who have just started learning Kotlin
・Learners who have already learned the basic syntax and concepts of Kotlin, but want to understand more deeply

・ Those who are interested in Kotlin but lack the skills to write programs
・ Those who want to have fun and challenge themselves to acquire programming skills

・People who like quiz-style learning and those who want to learn programming like a game
・ Those who want to acquire new knowledge and test their own knowledge as a measure for qualification exams