I have only one remaining puzzle unsolve, I would like to know is there a limit to the population on the island, cos now I have 65 people on the island and I see the message worried about housing yet there is no indication that I can build another house.

So am I suppose to stop the population at 65? I have no master builder yet only adept builders, so does that mean that I will not be able to solve the last puzzle until someone becomes a Master Builder?