Kings Cups rules Understanding the rules of a game is essential before playing it. To understand the rules of King's Cup, it's necessary to know what the game is and why it's so popular. King's Cup is the classic drinking game that is also known as "Ring of Fire," "Waterfall," and "Circle of Death." It has been a popular game for many years and is often used as an icebreaker in groups where people don't know each other well but want to have a good time with friends.