city building game?

How does one create a city building game where you click on something you want to place (a building or decoration) and then place it into the world?


edit: city building game:

I imagine that you would use the create and destroy options. That might not be the best way, but could work regardless. Especially if you made grid blocks that allowed you to “create” over it and destroy the original grid.

There is a pretty complicated answer. You basically drag and drop the buildings, as in This Game: