Klingon ships can be attacked with either phasers or photon torpedoes. Phasers do not have to be aimed, but their power and therefore damage amount falls off with distance, and the player must select how much power to put into each shot. Torpedoes do not suffer this drop in power and will destroy a Klingon ship with a single hit, but have to be aimed using polar coordinates. Later versions of the game expanded on this combat system by adding features such as Klingon ships moving after each shot if not destroyed, enemy attacks damaging systems such as scanners or shields, stars absorbing torpedoes that hit them, and a calculator to help in determining the proper angle to fire the torpedoes. Combat is turn-based, and Klingon ships will fire back at the player in their turn.