Tiles are laid out in an alternating pattern, kind of like a chess board. Tiles alternate between building tiles on one diagonal and landscape tiles on the other.
As soon as a building with your house is surrounded, you get 1 point if all the landscapes match, but you lose 1, 2, or 3 points if 1, 2, or 3 of the surrounding landscapes do not match. You can remove your house to reduce this loss, but at the end of the game, you get 1 point per house on your longest diagonal group of houses.
