Two teams of two. It refuses any other shape. Each side's two scores pair into one number, low score first; a birdie flips the other side's number, and a 10 or worse flips your own, both always on. Every hole shows on the receipt ("Hole 7: 45 v 54 (birdie flip!)"). Vegas has no ceiling on what it can cost, and the round's Matches page says so: the same banner that shows the worst case on the games that have a limit.
