Hello, this might sound daft but I've just started playing Civ 2 and I've noticed that the game is laid out isometrically but my settlers only move up or down, so they can only go to half the squares, much as checkers can only move to a black square on a checkers board. I thought maybe this was the way things were supposed to be, til I noticed that my neighbours had irrigated lots of adjacent squares - ie the 'white' squares on a checkerboard. Am I missing something really obvious? How do I move to these squares?