Challenge / play With your weapon

Question

Ping ,
Somebody can explain me the Play mode ?!
I choose my favorite langage, i ask to 5 questions , but after ??
I never saw people give me challenge, so how can i hope user versus i play , will give me challenge Back !
(I looking for take xp)
Nice Code at you !

Answer 1

Basically:
Choose language
Choose opponent
Start challenge
Answer questions
Opponent receives challenge
Opponent does challenge
Opponent wins/draws/loses to you.
You get XP

Answer 2

You were saying...?

Answer 3

And i have not saw this mode with Firefox, only on api

Answer 4

Yes basically , thx foranswer !