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A secret game is a sneaky, worldwide mess where people play without telling anyone. You gotta be challenged by someone else to join, and if you blab, you're dead meat.
My cousin joined the secret game and now he won't shut up about it. I had to threaten him with a fork.
My teacher got pulled into the secret game and now she's whispering math problems to the ceiling.
My dog tried to join the secret game. He barked at the challenger and got banned.