Attempting the hardest challenge in Chicago, unlike previous levels Chicago only has 2 levels of challenge, does this mean its only medium difficult?? No, no it doesn't, this is a tricky one, 1,400 journeys completed with no more than 8 stations on each line. Sounds easy but in reality, NO!!
Constantly having to count the number of stations on each line and planning ahead for the random station spawns and dealing with the limited spread of station types, ie, squares only ever spawn on the far right of the map, circles and triangles cluster together trying to force the formation of chains of one of the other making inefficient networks and so on.
Anyway, this is a fun challenging challenge, and I would recommend giving it a go if you have mini metro. Let me know how you get on with it and I'll see you again in another video of something.