To switch Clash of Clans accounts with someone, both players need to link their accounts to a separate Supercell ID. Each player should go to the game's settings, tap on "Supercell ID," and either create a new ID or log into an existing one. After linking, the other player can log into their Supercell ID on your device, allowing access to their account. Make sure to confirm the switch and ensure both accounts are backed up before proceeding.
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
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If you cannot remember your old clash of clans account, you will have to open a new one.
There are no codes in clash of clans.
There is no "best" base in clash of clans.
No, Clash of Clans is not available for Nook.