It was followed by the 1990 Sega Genesis video game of same name, and went on to become the yearly Madden NFL game series. It is sometimes called Madden '88 or Madden '89 to distinguish it from later games in the series.
The 1988 or 1989 version of Madden NFL, which was followed by a Sega Genesis game in 1990 with the same name and went on to become the annual Madden NFL series. It is sometimes referred to as "Madden '88" or "Madden '89" to differentiate it from later games in the franchise.