Rampart (Konami)

In this Famicom version of the arcade hit, you are faced with 4 different scenarios (of increasing difficulty) and more depth than the original game. But the basic elements of Rampart are still there: first you build a castle from Tetris-esque pieces. Next you place a series of cannons and use them to bomb the enemy. Then you repair any damage the enemy inflicted on your fort, and do it all over again. When you reach a certain number of points, the scenario is cleared and you can pick another one.