Cosmic Express

Draw a railway through a miniature space colony so that a train collects every alien, delivers each to a matching home, and reaches the exit. Early trains carry only one passenger, making the order of pickups and drop-offs as important as the route itself. Ordinary track cannot cross itself, so visiting an easy stop first may cut off the rest of the colony. Later puzzles introduce extra carriages and passengers whose slime makes seats unusable for other species, changing which journeys can share a route. Branching constellations offer alternative puzzles when one layout stalls you, without turning the challenge into a race against time.