The popularity of beer pong is due to the reason that it’s an extremely easy game to play with nothing but beer, a table tennis ball, and some plastic cups. This is played one on one or between teams of two, so add as many players as you want.
Fun to set up and easy to play; Set 10 cups forming a triangle, fill cups to desired level with drink of choice and shoot the ball, if the ball lands in the cup, the opponent CHUGGS the cup. Alternate throws between teams and the team to eliminate all of the opponents cups first wins.
Don’t forget side water cups to wash your balls...