Massive amounts of ads after every level and if you have to replay a level.  I expect ads to help developers to pay for the game.  However, this game is way beyond reasonable.  Also, over 3,000 levels are promised.  I am on the last section.  There are a total of 1500 levels.  Worse, they aren’t that hard at all.  I have only kept playing to see if the levels would get harder.  They haven’t.  I cannot recommend this game.