Pilot your spacecraft through numerous levels while dodging increasingly difficult waves of enemies in this top down scrolling space shooter. Rack up the points by shooting enemy structures and ships. Score an extra life by getting enough points or destroying a squares labeled '?'. These squares appear in groups and one of them will award an extra life when shot. Lastly, shooting an orange orb will release a smaller ship and if it attaches to your ship, be prepared to unleash an onslaught of rapid fire on the enemy. 

Summary from the instructional manual via http://www.consoleclassix.com/nes/star_force.html 

"In the year 2010 of Dimension Almanac, there was a mysterious planet named GORDESS which was moving in the darkness of the cosmos for the purpose of mass murder and plunder. Everyone gave up fighting against GORDESS because of its awesome power. One day a brave soldier riding a space patroller challenged GORDESS to fight. People called this space patroller "FINAL STAR", wishing to be saved. You must bring an end to the murders which have been committed for the past 2,000 years.  "