Outer Limits

Your mission is to guard the city by blasting all Dupliod space ships before they fire on your city. The city supplies you with all your power. Once the city is lost so is the out post. There are basically two types of Dupliod ship design. The first type simply flies by and fires at the city. The second flies back and forth trying to avoid your laser blasts. These ships are smaller and are harder to hit then the fly-by kind of ships.