Why do I fail to close an advertisement?

Question

Recently I cannot close an advertisement about English learning app that appears after a challenge. The button doesn't work even after timeout. I tap the button but nothing happens. I have to close the app and launch it again.

Answer 1

you can try click the back key

Answer 2

Yes the back key will help you. The as doesn't even need to finish.

Answer 3

✳AsterisK✳ thanks, it works