android - How I can build sign-in to play games without google normal sign-in button - Stack Overflow

I've a question about google play games services. My question is why I can't create sign-in to play games without google normal sign-in button ? I played many games and those games has sign-in to

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android - How I can build sign-in to play games without google

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android - Google Sign in not working properly - Stack Overflow

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android - How to use the google sign in button assets - Stack Overflow

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