This game is really addicting. I really enjoy it. but a couple things irk me... Latest upgrade made the daily challenges harder IMHO. The levels used to be achievable without additional boosts, and now it's necessary to use boosts. You can wait for the daily bonuses and challenges to get these boosts or you can buy it. If you have the patience to wait for your lives to reset, then you'll be fine. Was 4 stars, until the challenges got much more difficult so now it's 3 stars.