Kotlin Challenges
Learn Kotlin for free by writing real code, graded by hidden tests.
- Kotlin
- 46 lessons
- ~9 hours
- Free
Learn Kotlin for free on Libre Academy with the Kotlin Challenges challenge pack: 46 interactive lessons you complete by writing real code in a built-in editor, graded instantly by hidden tests. No paywall, no sign-up — it runs in your browser and the free desktop app.
What you get
- Hands-on lessons with a real editor and instant, test-graded feedback.
- Free and open source — no account required to start.
- Runs in your browser, and offline in the free desktop app.
- Kotlin desktop app (native toolchain).