This use to be a good little time killer but it has gotten so hard to complete challenge levels all you can do is get a few level 6 flowers then you just leave it and come back every few hours to merge stuff until you finally get a level 9 star then you get another ten minutes of game play before it's back to waiting again. It would be ok if it would run in background so you could use device while waiting but no it takes over your device. It's just so boring