What are the rules and pros an cons of weapons challenge

Answer 1

seems like it is a BIT one sided​

Answer 2

I do not understand the reasoning behind this

Answer 3

Rules : Answer within the time limit.
Pros : You get to explore different kinds of questions. Answering correctly gives you a satisfaction and winning gives you XP.
Cons : You don't get to see the correct answer for the questions you answered incorrectly.