A vector (wireframe) shooting 'em up game commanding unprecedented firepower, the player maneuvers seven fighter ships in a squadron formation. All seven ships fire at once when the FIRE button is pressed, producing a spectacular missile salvo. The object of the game is to accumulate points by destroying incoming enemy ships while dodging fireballs launched by these enemies. TAC/SCAN presents the space battle from two entirely different perspective views in the course of the game, with visually exciting transition sequences interconnecting the two views. The player begins the game with a seven ship formation, and a supply of reserve ships which are shown above the player score on the screen. The number of reserve ships at the beginning of the game is switch selectable. An ADD SHIP button placed next to the FIRE button transfers one of the reserve ships in the squadron formation. Where the reserve ships are placed is shown by a half-intensity fighter in the formation. This 'add ship' position continuously cycles between the empty squadron positions, and the advanced player will time the ADD SHIP function to place squadron fighters at preferred positions. A player fighter is blown up by contact with either an enemy ship or an enemy fireball. Whenever all seven ship positions become empty the game is over, EVEN IF THERE ARE REMAINING RESERVE FIGHTERS shown above the player score. Thus the player must continuously judge when to add reserve fighters by using the ADD SHIP button. Add them too early, and they might be depleted too fast; use them too late and you risk ending the game with reserve fighters left over.