Talk:Backing Up Game/@comment-207.118.234.174-20150929112754/@comment-24668482-20150929123100

If you have a back up of your user profile (instructions above), then you can replace the current player.prf file with the back up version and that will restore progress. But if you don't already have a back up, it is unlikely you will get your progress back. It sounds like there is a problem with your game, so backing up your progress and then deleting the game before reinstalling and restoring your progress from that back up might stop it happening again.

Otherwise, contact the game's supportdirectly for help and for the refund for crystals lost. (though you may need to go directly to the appstore you purchased the crystals from for a refund).

Without knowing more details of what platform you are playng on/what version of the game, there is not much more advice that can be given.