Quick answer: Everyone starts drinking together. The player who drew the Ace stops first; then players may stop one at a time in clockwise order.
What Does Ace Mean in King's Cup?
The Ace starts a Waterfall. Once everyone begins, each player waits for the person before them to stop. Nobody needs to finish a drink, and small sips or a non-drinking action work just as well.
Common Ace House Rule
Use a pose waterfall: everyone holds a pose and may relax only after the previous player does.
House rules differ by group. Confirm the meaning before the first card is drawn, allow anyone to choose a non-alcoholic alternative, and never pressure a player to participate.
Ace Rule FAQ
What is the Ace rule called in King's Cup?
The common Ace rule is called Waterfall. House rules can vary, so agree on the meaning before play.