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You cannot delete your Clash of Clans account unless by Supercell interaction.
DELETE clash of clans, then download it again
If you meant "how do you turn off clash of clans notifications" then you go to settings>notifications>clash of clans and turn everything off
You can recover your clash of clans account by using another Android device.
So far, no way unless you are logged into the same game center account as before and re-downloaded Clash of Clans.
Change your game center or google play account.
delete the game data files
eubie
If you cannot remember your old clash of clans account, you will have to open a new one.
Go to settings, click sync account, then click old device
There are no codes in clash of clans.
No, Clash of Clans is not available for Nook.