Catan's expansion to six players requires the cities and knights cards and adds turn-order complexity that the base game does not need. At six, the game is more a social experience than a strategic one — the board fills quickly, trades become constant, and luck plays a larger role than at four. This is not a criticism of the six-player experience, but it is a different game.

For groups that regularly play Catan at six: consider exploring the five and six player expansion maps rather than using the base board. The larger maps accommodate the additional settlements and roads without creating the congestion that the base board produces at six.

For groups undecided about whether to invest in a six-player Catan: the experience is most fun with a group that treats the chaos as the appeal rather than as a design flaw. If your group wants strategic depth, four-player Catan with Cities and Knights is the better experience.