Honest Review: Finished the game at 3100 levels and all challenges as well.. repeated levels, just to unlock challenge puzzle...no point of playing any further... If you want to get rid of annoying ads, use Adguard ... It's very much useful...no worries about coins, just build the buildings and collect rewards....I have around 10 million coins, not useful..... don't waste your time, this game has a dead end.... Developers are focused on making money by playing ads only...