The rules
Pink Ball runs alongside a tournament. Every golfer still plays his own ball and posts his own score. On top of that, each group carries one extra ball that the golfers take turns to play.
The rotation
The group agrees the order on the first tee, and that order repeats for all 18 holes. In a foursome, the golfer who plays it on the 1st plays it again on the 5th, 9th, 13th and 17th.
Call it what you like
Pink Ball is the usual name, but it is the ball in the bag that matters. Groups play Red Ball, Devil Ball or Beer Ball, and the rules don’t change. In Halved the tournament director types in the name, up to 16 characters, and that name is used everywhere the game appears.
Ties and the money
Scoring it without a spreadsheet
Halved tracks the ball for every group: whose turn it is on each hole, which groups still have it, and who wins if more than one survives.
Everyone knows who lost it.
Free for the field. Halved tracks every group’s ball, whose turn it is, and pays the last group standing.