How do I find lost data of Game Center, although I never deleted it

Hello GameCenter7e7,

Welcome to Apple Support Communities. If your saved game was overwritten or lost in Game Center, it may not be able to be retrieved. Since that data is kept in iCloud it would not be stored in a backup. Learn more here: Access your Apple Arcade gameplay data on all of your devices.

You can check to see if you logged in to this game by a different method, like through your Facebook login or another method. You can also reach out to the developer to see if there is any way to retrieve your data. See how to contact a developer here: How to contact an app developer.

We hope this helps.

Cheers!