Scramble is a team play format where you choose the best shot after each shot is taken and play from until the ball is in the hole. It does require two 2-man teams, four players, but it can be setup locally and with one controller.
Setup a scramble match and use the short tees (I played TPC Boston) and set it to either front nine or back nine. There is no need to play the full 18. Proceed to hit every shot with all of the players until you are done!
And that sholud be 15G!