How can I take part in a challenge?

Question

how can I do the challenge, I don't know how to play it.

Answer 1

If you mean challenges in the Play section, then tap on the green button with "+" sign, choose weapon, choose opponent, click on the "Start" button.

Answer 2

Just solve the challenge in your code base. If you like, comment on the challenge (you can also post a link to your code there).