Square Times is the achievement to unlock extreme mode for New York, the map the achievement has to be played on to get. To get it you need to deliver 1600 passengers in New York having only two lines touching squares.


For this achievement, I would recommend to have one large line go through all of the squares and middle island, and other lines going trough the other two sides. Make sure to have at maximum, two lines touching square stations, but try to only have one line touch squares.