The list of features that Dune II debuted in real-time strategy gaming is impressive. It was the first RTS to use the mouse to move individual units. It was the first to use building bases and then units. It was the first to use a development technology tree, permitting the construction of advanced units only after certain buildings were constructed. It was the first to use units that you could move and then deploy as a base. It was the first to use different factions with different goals (and strategies). It was even the first to use a world map that you chose your next mission from. This is an impressive list, and these features are now commonplace in RTS games, but were fresh and new back when Dune II was released.