Help my iphone has gone crazy?

I have so many games in my iphone6plus, i just downloaded like 30 of them and they are asking me to log in to Game Center. Even though i know and i remember that i have already logged in. Now, when i try to get inside the Game Center, the page freezes and even that i have internet connection it doesn't load. As for in the settings, when i tap the Game Center button, the whole iphone gets freezed and dies. I don't know what to do please help! What can it possibly be?

Delete some of the largest and least played games.

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