The coin-matching game can be found in most casinos throughout the world. While this game can be played fairly, there are people who use it as a way to scam players.
The scam is usually run by two operators. The first operator joins the game along with the victim. Then the second operator joins shortly after and proceeds to lose the game.
After threatening to call the police, they convince the victim to pitch them hush money, which the two operators later split.