How does the XO event map work?

Just go to the side that answers the question correctly (X - false, O - true). If you get teleported to the bottom of the map it means you got the question wrong and there's no reason for you to stay there anymore since you can't answer any more questions so you can just leave.

I see. So if I lag too much on entering the map to answer the first question, there's no point even joining the game. Lovely.