I cannot go past the 18th level in the 3rd tier. The application force closes and I am not sure why. I have made sure there weren’t any other applications running. Cannot figure it out. I hope the developers can because I would really like to keep playing this game. 4 stars for being a good game, and if the problem gets fixed I would be more than happy to re-rate this game at 5 stars. I like that this game doesn’t make you pay to play and have some success if you are willing to be patient.