Pro Yakyuu World Stadium '91 is a sports game in which players participate in baseball matches, utilizing realistic controls and team management features to simulate the sport. In this game, the setting is based on professional baseball in Japan, featuring a roster of fictional players that mimic real-life teams and gameplay scenarios. It stands out with its detailed graphics for the era, authentic gameplay mechanics, and the inclusion of a variety of game modes that appeal to baseball fans and sports game enthusiasts alike.