Answer 1

I'm not a beta tester either and I couldn't find Kotlin before but I updated SoloLearn's app today and it's showing Kotlin now 😀👌

Answer 2

My app is missing it too, but you can write Kotlin codes in the browser.

Answer 3

You can't see the kotlin playground. But you can save the template and change it and run it. And in the website the kotlin playground is visible.

Answer 4

Check this out, it should help you out d:
https://www.sololearn.com/discuss/1052386/?ref=app