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With brute forcing possibly. Might take a while though. Are you absolutely sure its a SHA-256 Hash?

Yes I am sure. It's a game. I need to get into it's admin panel for that I need the username and pass user is prob admin and pass i need to hack hash inorder to get it

If you dont own the service, I dont recommend doing it. But if you want to try it, find a brute forcing application to use.
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That one uses your GPU so it goes much faster.