This could be a really great game. There are three major problems with it. 1. You have to pay to get anywhere in this game. The only time you get to do more than takeoffs or landings is right after you get a new license or new plane. That happens very seldomly, unless you want to pony up some cash. That should NEVER be the case. 2. Other players have hacked the challenges giving them impossible results and winning every time. If the developer doesn't address this then they may as well remove the challenge feature as it is broken. 3. The developers responses to these reviews prove they aren't really reading them. **Update - As expected, and as I described above, the reply below is a copy and paste reply that has no relevance to my review.