Well this game need some updates. I cant build many things on snow tile. This game doesn't have a permanent night view like day view. When you search a resource like oil or food of same level, so it will show you only one field even when you click many times to search other fields, so in this case you have to search on your own by moving map and it will take a lot of time. Gold mines can't be more then 10 so you will get limited gold.