All-Star Baseball '99 [Model DMG-AB9E-USA]

Scores edit mode:
Choose any game mode, when the "Team Options" menu is displayed (no matter if you enter this menu before the game, or during the game by pressing Start), then press Up, Down, Left, Right, Up, Down, Left, Right plus any other button to complete the sequence. A sound will confirm correct code entry. Now, start a game in any mode, enter the "Team Options" menu by pressing Start and enter the "Scoreboard". By pressing Left or Right choose current inning, press Up to increase scores of upper team, or Down to increase scores of bottom team. Also, for the game modes "Playoff" or "Season", when you quit with the higher scores than your opponent, you'll instantly win a current game and the result will be saved in the password as well, as against the normal game without cheat, which is threated quitting as a loosing current game all the time, not mater what you current score is. Repeating this process you can win the entire game in no time.