Two players, or a player against a computer-controlled opponent, take turns selecting an angle and a firing speed. A trajectory is then calculated and displayed, often as a simple line plot. Players must adjust their aim based on the target's distance, and the first to land a direct hit wins.

Start with a reasonable angle and velocity based on the measured distance. If the shell falls short, increase the angle or speed slightly; if it overshoots, reduce one of the two values. Change only one variable at a time for easier correction.