Events get worse and worse. I've never been able to complete an event (all chains). Even just barely making the event pass gets harder and harder up to impossible in the current valentine event even with massive spending of coins. Not to mention that you get basically nothing out if it currency wise. This was the last event I have tried, it is incredibly time consuming and frustrating. The only reason I'm keeping the game for now is that you don't need a facebook account to save progress.