What is the point of Trivia Crack levels?

I see that with time I move up levels as I play games. But there is hardly any documentation that shows what happens when I move up levels? Do the questions get tough? So if I play with a friend whose level is much lower than mine does that mean I get different difficulty level questions than him?

I'm on level 220 and have answered over 25,000 questions correctly but I've been noticing that my questions have become more difficult and I'm getting beat by players with few games and lower percentages than me. So It appears the answer is yes. Higher level, harder questions.

I doubt that they get harder as there is no means to rate a question's difficulty in the Question Factory. I'm on level 110 and I still get ridiculously easy questions all the time.

I'm on level 334 and can guarantee you the questions definitely get much more difficult. They become much more exact. For example, "What jersey number did Don Drysdale wear in the 1968 World Series?" (Not a real question, but just a similar one). No more general questions like, "How many players on a baseball field during a game?" At this level it's very difficult to win many games (at least for me).