It's keeping mine just fine. What are you playing on? I'm using the iPhone 6 running iOS 9.3.5. I just checked. I haven't played and everything I unlocked is unlocked. It is saving properly on my end. Rocketcat needs to update them regardless. They are too good to not have a maintenance update. Billy
Hmm that's odd. Works for me on 6 Plus with latest version of iOS 10. As others have said this is one of the best games on iOS and it has been on all my phones since release. Hope it receives an update one day or I'd gladly rebuy a remastered version. Viva SQH.