Downloaded zynga game apps on gen 4 and they won't open.
I downloaded 2 zynga game apps and they load all the way to 100% and then it goes back to my app pages. How do I get into the games to play?
See:
iOS: Troubleshooting applications purchased from the App Store
Contact the developer/go to their support site if only one app.
Restore from backup. See:
Restore to factory settings/new iPod