(adsbygoogle = window.adsbygoogle || []).push({}); I have just bought this item of ebay and it worked

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Can someone tell me how he gets all these coins

message him as he said that he need to challenge you

Yeah but he's given me the coins but I don't understand how he gets all them

Could be either a glitch in the game (unlikely) or it could be the server-side areas of the app are susceptible to memory hacking.