Don't spend money so that you can open additional chests. You'll never be able to open the last ones. I have played lvl 26 and lvl 30 over and over and over, just SO many times, and it's impossible to get 3 stars so you can get the last chests you paid for. So then I rather stupidly paid money for more wild cards and I STILL can't get 3 stars. I'm done with this game. So completely frustrated.