For those who think the game is not a play to win because they've been playing it for years, I am saying this. Yes, it was not like that before. They started doing that about 1 year ago! Before that, you could have completed even the red level without booster, after 2, 3 tries. But now, some levels (especially the red one. Let's not talk about the new orange levels) are becoming so difficult that you might spend all your boosters. The only choice in those cases is to wait or spend money to win.