This looks really interesting! What makes some voyages designed for solo play and some designed for group play?
Hi - good question. It's mostly the wording of the storytelling prompts, e.g. the group play voyages say things like, "Go around in a circle, with each player making one suggestion." There's also a slight assumption that the solo voyage might be played more gradually over a longer period of time. But it's not a rigid distinction, and you could definitely play any voyage either as solo or group with a little interpretation.