Gallop Racer 2003 is an update to its earlier versions, including the basic modes (exhibition and season mode), six different jockeys to pick from in the season mode, 32 other tracks, and over 3000 different horses.
Players can breed horses through a series of mini-games, with the conclusion determining the type of horse. The better the player is at the mini-games, the more influential the breed. In season mode, the player can gamble on races and use the money to improve their stable’s training facilities. It also includes an intensive training program for new Gallop series participants.