Sometimes clever play is just not enough and have to rely on luck with multiple trys. Otherwise the events are frequent, the rewards plenty if you put in the work and time. My only problem is that, if you get stuck on a level and lose for hours you get 0 event items. In my opinion we should get at least a few% of the stuff we earn because it can make a collection or a redesign impossible. Its really disencouraging when you get nothing and still nothing again and again.