They are a bit of a pain. You generally have to paint a line of Sea Cliffs or Water, a stretch of Castle Low and a stretch of City in tile-thin rows before getting them to place.
You should also note that the version marked "Passage" has a walkable passageway, whilst the other version has a walkable roof but requires you to set up a door transition through the tunnel.
Modifié par _six, 24 octobre 2010 - 03:32 .