Beer pong, also known as Beirut, is a drinking game in which players throw a ping pong ball across a table with the intent of landing the ball in a cup of beer on the other end. The game typically consists of two two-to-four-player teams and multiple cups set up, in triangle formation, on each side.There are no official rules, so rules may vary widely, though usually there are six or ten plastic cups arranged in a triangle on each side. Each side then takes turns attempting to shoot ping pong balls into the opponent's cups. If a ball lands in a cup, then the contents of that cup are consumed, and the cup is either placed aside or reinserted into the triangle. If the cup is reinserted and the other team knocks the cup over, it is removed. If the opposing team throws the ball into an empty cup, they must consume the contents of one of their cups. The first side to eliminate all of the opponent's cups is the winner.The order of play varies—both players on one team shoot followed by both players on the other team, or players on opposite teams can alternate back and forth.