Do both players get asked the same set of questions in the challenge?

Question

I have a few other questions besides the title:
1) Do both players get asked the same set of questions in the challenge?
2) Do questions get slightly harder as your level advances?
3) Can you lose levels if your experience drops?
4) How can I prevent players from challenging me in a given language (e.g. C++)?
5) When are new languages going to be added?
6) When will a private message system between users be available?

If (user answered questions >= 1) {
print("Thank you!");
}

Answer 1

yes same question is asked to both but there is a extra tie break if tie occurs
sometimes even after all correct tie