I have been receiving emails from people who just updated their iPad to iOS 7 and now the app is asking for them to purchase the “Unlimited Games” again. If you do run into this, all you need to do is go through the in app purchase again. Apple will not double charge you for this as long as you are using the same account you purchased the app before. It will then say something to the effect of; You have already purchased this app would you like to download it again. Tap Yes and you should be good to go.
Sorry for the inconvenience,