Manic Digger is the Free sandbox in which you build cities, trade with other players, plunder them and even kill. In game is a lot of content. You can build all that you want in this game. Whole cities are under construction for no reason other then the supply of wood and a stone. Cities-locks constructed in an environment of natural barriers and even, fortifications from brick walls. All what you will face in game is constructed by players. Source: The Developer Website.