to reset ipad, do i click Reset All Settings or just Reset Network Settings, having trouble getting into Candy Crush

Try this - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons. (This is equivalent to rebooting your computer.) No data/files will be erased. http://support.apple.com/kb/ht1430

The reset network settings resets your wifi settings.

Reset all settings - What this effectively does is to reset some of your Settings to factory default. It’s not a complete removal of settings. It removes all of your preferences for Wi-Fi, Bluetooth, Do No Disturb, Notifications, General, Sounds, Brightness & Wallpaper and Privacy. It doesn’t affect your data. All of your email accounts will remain intact, as well as any SMS text or iMessages.

iOS 7: Help with how to fix a crashing app on iPhone, iPad (Mini), and iPod Touch

http://teachmeios.com/help-with-how-to-fix-a-crashing-app-on-iphone-ipad-mini-an d-ipod-touch/

Troubleshooting apps purchased from the App Store

http://support.apple.com/kb/TS1702

Delete the app and redownload.

Downloading Past Purchases from the iTunes Store, App Store and iBooks Store

http://support.apple.com/kb/ht2519

 Cheers, Tom
😉