One more note about obsolete state of the project

src/i_introduction/_0_Hello_World/n00Start.kt

@@ -3,6 +3,21 @@ package i_introduction._0_Hello_World
 import util.TODO
 import util.doc0
 
+/*
+
+Note that this project is obsolete.
+For the last version of Koans, check either
+online version
+  - https://play.kotlinlang.org/koans/overview
+or
+the course in the EduTools plugin
+ - https://www.jetbrains.com/help/education/learner-start-guide.html?section=Kotlin%20Koans
+ - https://www.jetbrains.com/help/education/install-edutools-plugin.html?section=IntelliJ%20IDEA
+
+The task content can be found at https://github.com/Kotlin/kotlin-koans-edu.
+
+ */
+
 fun todoTask0(): Nothing = TODO(
     """
         Task 0.