how am I suppose to remotely delete my google account on a device that is accessing a specific app I recently added my account on a device so he could access my game app whick is the Clash of Clans (COC)

now that person is controlling my COC using his device and cursing my clann mates via coc chat..
Go to Google.com or any Google site.
Sign into the account you're referring to, if you're not already signed in.
Click the circle avatar or photo (a blue person by default) in the very top right corner of the page.
Click "Account".
Under "Recent Activity", click "Devices".
Click the device you're referring to.
There should be a big red "Remove" button next to the words "Account access" under this device once you have clicked the device.  Click this button.