Q: I want to reset my Game Center because mistakenly I linked wrong account .i'm talking about clash of clan game . And I request to Apple please make a system that we will use gmail on our clash of clan account because Game cntr is vry difficult to use

Click/Tap > HERE

And... Click/Tap > HERE

Using Game Center on your Mac or iOS device - Apple Support

....

If you have an issue with a Game Center game, follow these steps:

1. Make sure that you have the latest version of the game. To check for updates, go to App Store > Updates.
2. Test your connection using a different game. If you can't connect with a specific friend or player in multiple games, they might need to check their Wi-Fi connection and router settings.
3. On iOS, try opening the game from the Home screen, rather than from within Game Center.
4. If you can't solve the issue, follow the steps in the next section to report the problem to the developer.

Report a problem

To report a problem with a game, follow these steps:

1. Search for the game in the App Store.
2. Select the game and look for the game's support link. On iOS, look on the Reviews tab below App Store Ratings. On Mac, look in the right column of the of game's App Store page.
3. Use the support link to contact the developer.

I guess my point was (and is) that you tell us next to nothing.

Tell us a Story

- with a beginning, a middle and end. We need to understand everything that you know and have experienced.

If this issue is new, tell us what immediately preceded its onset - add software, upgrade or update? New equipment?

Quoted from  Apple's "How to write a good question"

   To help other members answer your question, give as many details as you can.

• Include your product name and specs such as processor speed, memory, and storage capacity. Please do not include your Serial Number, IMEI, MEID, or other personal information.
• Provide the version numbers of your operating system and relevant applications, for example "iOS 6.0.3" or "iPhoto 9.1.2".
• Describe the problem, and include any details about what seems to cause it.
• List any troubleshooting steps you've already tried, or temporary fixes you've discovered.

For a detailed "coaching", please see the User Tip > "Help us to help you on these forums"<https://discussions.apple.com/docs/DOC-5431>

"Keep It Short and Simple" - Take your time... but be thorough - ÇÇÇ

We here are NOT Apple - we are users, like you. We cannot DO anything, only point out what Apple may have to say in their published articles - or techniques we know from our experience - I have NO experience with 'reset Game Center Account'

Lol game wrote:

 

I Don't want to create another account so I told you how to reset Game Center. And you told me bla bla bla .... !!! I said you I'm using iPhone 6 Plus .. iOS 9 ..

 

I Think you don't slove this problem,it's okay. I'm asking suggestions on clash of clans staff I know they give me suggest. Thank you and sorry for waste your valuable time.

try writing your STORY - all of it - n your native language

meanwhile, here are more search results -

gmail? - do you mean GooglePlay?

Coexisting with Game Center - Google Developers

Rating: 3 - 1,785 votes - Free

Game Center is a gathering application which has lots of different small APPs, to be convenient and quick for viewing. It not only saves the time you search, but ...

Google Debuts Google Play Games. It's like Apple's Game ...

May 15, 2013 - A significant announcement for game developers emerged from the Google I/O keynote in San Francisco this morning: Google officially ...

Lol game wrote:

 

IF you don't know how to reset Game Center why u waste my time !!! U r expert !!! Lol .... Don't try to tech me about Coc !!! My CoC experience give me another linking chance lol .

We here ARE NOT Apple... SO we here cannot RESET anything.

The only reference to the term "reset" regarding Game Center is in the Using Game Center article (BIG Blue Link above) - see reset below

Get help

If you can't sign in to Game Center or stay connected, follow these steps:

1. Make sure that you're connected to the Internet.
2. If you can't create an account or sign in to Game Center from within a game, try to create an account or sign in using the Game Center app.
3. Sign out of Game Center, then sign back in. If you can't sign in to Game Center with an Apple ID, reset your password or use another email address. To manage your Apple ID, go to My Apple ID.
4. If you're using a Wi-Fi connection, make sure that your Wi-Fi router is configured for Game Center.
5. If you can't sign in on a Mac, continue with the steps to resolve sign in issues.

I am expert ONLY in finding information that users such as yourself are unable to find. I do not understand many of your statements.

You also have not followed my advice of telling us a complete and detailed Story.

My last resort link is:

Store Group - Contact Us - Apple Support

You can try to contact Apple - iTunes support here and ask how to reset your CoC account:

http://www.apple.com/support/itunes/account/

This is where your account is, so this may be where they can help you. We can't because there is nobody from Apple here and they probably told you to contact Apple, which is what you need to do.