Four players, three segments. Partners rotate every six holes, so by the 18th you have played with everyone in the group — and against everyone.

First pairing. Best ball, match or points — whichever your group prefers.
Partners change. The player you just beat is now on your side.
Final pairing, and everyone has now partnered everyone. Individual totals decide the round.
The only thing that ever goes wrong in Sixes is someone forgetting who they are with. Still You states the current partner and previews the next rotation before the segment turns.
Every one of these is a setting in Sixes — set once for the group and reused every round.
Fixed sequence, drawn, or seeded by handicap.
Six holes, or three segments across nine.
Best ball, aggregate, or match points per segment.
Segment winners only, or a running individual total.
The friendliest game in the app — right up until the last six holes.

Beta groups get all six modes from day one. Four to a group — bring your regulars.