Can you unlink a gmail account from a game?
You can't unlink an account, but you can add multiple accounts! If you wish to start over, follow these steps:
1) Add Gmail Account(s)
Settings - Accounts and Sync - Add Account - Please add 2 or more Gmail accounts.
2) Link the current account to one of your email
Enter game - Settings - Link Account - Choose one of your Gmail accounts - Confirm Link - Authorize.
3) Switching to a new account
Go to Settings - Choose the option “Change Account” - Choose another Gmail account.