Hi @sarahbirk and welcome to the Community Thanks, @Pummy Raj for flagging this to me!ย
@sarahbirk - It sounds like the problem came from your device. I would advise you to clear cache and cookies regularly and always make sure you have the latest game version updated as that prevents issues from happening.ย
Please do that and relaunch the game. You might have to replay the level, but 504 is a fun one and I'm sure you'll pass it easily ย
Let us know how it goes! And since you're here, don't miss your chance to win some extra Gold and boosters, right here! There's always something to win on the Community, so stay tuned! Good luck ย