The boxers in the game reflect characteristics of the real-life fighters who they are based upon. For example, Henry Cooper, who had a tendency to get cut easily in real life, receives cuts after taking fewer punches than other fighters. Similarly, reflecting the fact that George Chuvalo was renowned for his ability to take punches (he was not once knocked down in his career), it is physically impossible to knock him down in the game (even if the player continuously punches him in the stomach for 15 rounds).