The Bases Loaded series is a franchise of baseball video games that gained popularity on the Nintendo Entertainment System. It includes titles such as the original Bases Loaded (1988), Bases Loaded II: Second Season (1990), Bases Loaded 3 (1991), Bases Loaded 4 (1993), and later transitioned to 32-bit consoles with Bases Loaded '96: Double Header (1995). The series is known for its distinct television-style camera angle behind the pitcher.
Developed and published by Jaleco, the franchise originated in Japan under the title
Moero!! Pro Yakyuu. Because the series lacked an official Major League Baseball license, early entries featured fictional teams and players with highly distinct attributes. The original
Bases Loaded gained a cult following for its memorable roster, including the exceptionally powerful batter Paste, and the inclusion of batter-pitcher altercations following beanballs.
As the series progressed, Jaleco introduced unique gameplay mechanics to differentiate each installment.
Bases Loaded II: Second Season introduced a biorhythm system that affected player performance based on physical and mental states.
Bases Loaded 3 shifted focus toward player evaluation, challenging users to play a perfect game against a level-10 opponent to truly "win" the game.
Bases Loaded 4 served as the final 8-bit entry, refining the traditional mechanics before the franchise transitioned to 32-bit hardware. With
Bases Loaded '96: Double Header, the series incorporated real-life players through the Major League Baseball Players Association license, though team names and logos remained fictional.