I can certainly understand you are wanting to use the game unlock!
I am so sorry to hear that you are still having issues, I definitely understand how inconvenient it must be for a purchase to not work as expected. I would be more than happy to assist you with this.
I do have some steps that should be able to help get this app up and running properly.
Please start by force closing the app to refresh it. To force close please press the Home button two times quickly. You'll see small previews of your recently used apps. Swipe left to find the app you want to close. Swipe up on the app's preview to close it.
You can then restart your iOS device, which will refresh the device itself.
Next, I would suggest that you check the App Store for available updates to ensure that the app is up to date. To check for updates please follow these steps:
1. Make sure that you're using latest version of iOS. To do you can tap Settings > General > Software Update
2. Open the App Store and tap Updates.
3. If updates are available, tap Update All.
4. If asked, enter your Apple ID password.
You might need a Wi-Fi connection to update some apps.
If the issues persists I would suggest deleting and re-downloading the app by following these steps:
1. Tap and hold the app until it jiggles.
2. Tap the X on the app.
3. Press the Home button.
4. Go to the App Store and download the app again.
5. Wait for the app to download, then open it from the Home screen.
If you see this issue again after reinstalling the app, please contact the app developer for additional help. To reach the developer of this specific app “Dark Parables: The Final Cinderella - A Hidden Object Game with Hidden Objects" you can go here and fill out the contact details: http://www.bigfishgames.com/blog/ios-iphone-ipad-ipod-help-faq-and-technical-support/'
You can also show them a copy of this email so they know which troubleshooting steps you have already tried.
For more information on troubleshooting apps please visit: If an app you installed unexpectedly quits, stops responding, or won’t open https://support.apple.com/en-us/HT201398
I hope this all helps. If you need anything else please don’t hesitate to reach out to me.