Did you ever play the game?.........
The children all stand (or sit) in a circle with their hands out, palms together. One child, called the leader or 'it', takes a button (usually provided by an adult) and goes around the circle, putting their hands in everybody elses's hands one by one. In one person's hands they drop the button, though continue to put their hands in the other's so that no one knows where the button is except for the giver and receiver.
The leader (or alternatively all the children in the circle depending on your preference) starts the other children guessing by saying, "Button, button, who's got the button?" before each child's guess. The child guessing replies with their choice eg: "Billy has the button!"
If you have the button, haven't been guessed yet, and it's your turn to guess, you choose someone else so that no one knows it's you.
Once the child with the button is finally guessed, that child is the one to distribute the button and start a new round.