Warning!! Purchases, video ads and app downloads required to advance to higher levels
When we first got this game, I was a fan: it's cute, musical, etc. But recently we found that my son couldn't progress without buying currency ($1 for 500,000 coins), watching ads and/or installing apps for diamonds.
The app download choices are bizarre. You earn "diamonds" for downloading apps like twitter, McDonald meal specials, tax filing, games, etc. At a certain point, diamonds are needed for monsters and achieving goals to move to the next level.
The one video ad I watched was a 30 second ad for a game app. I watched to find out what is going on with this game and also to see if that would unblock progress. It didn't--by watching the ad, we "earned" a discount on buying coins (double the coins for $1).
I don't know whether the game has changed or whether the issue only surfaces at higher levels. I would not have gotten this game had I known this was coming.
My son got really into the game, avoided all the ads/downloads/purchases, and then finally got stuck. Bad experience.