Player controls are clockwise and counterclockwise rotation, forward thrust, and firing missiles. Whenever the player is hit by a missile or flying saucer, the screen flashes and the player's rocket spins rapidly and disappears before reappearing in the same location. If a flying saucer is hit by a missile, the screen flashes, and the saucer briefly disappears. Counters on the right side of the screen track the number of times both the player's rocket and the saucers have been destroyed, as well as how long that round of gameplay has lasted. A round has a time limit—adjustable by the operator—of 60 to 150 seconds, with a default of 90; when the time limit is reached, the game ends if the player's score is lower than the computer's. If it is higher, the black and white colors invert in a "hyperspace" feature, and another round begins for free; the game continues on to new rounds with the display colors inverting indefinitely if the player continues to win. One round costs a quarter, or two quarters if the machine is adjusted against the instruction manual's recommendations for optimal pricing. The game displays distorted characters if the player or computer scores pass 9, and each score independently resets to 0 for both visual and gameplay purposes if it reaches 16.