I have been using this app for a while now. I now only do the Daily Challenge and random Master level puzzles. They have a Championship every several weeks where I had led several times. I earned a Bronze medal my first try. The next time I played I was in the lead and three names bested me in the space of playing a single game, one name jumped ahead of me by the equivalent of four games. I averaged 17 minutes a game and don't think it is humanly possible to have these names jump ahead. I emailed the group admin and suggested AI was being used, either their algorithms or hacked. Either way, I suggest not getting sucked into their Championship program. It's rigged.