Kore ga Pro Yakyuu '89

Select pennant mode, then highlight the "Exit" option at the "Team Roster" screen. Press II, Run.

Select pennant mode, then highlight the "Exit" option at the "Team Roster" screen. Press II, Run.

At the Pennant or Vs Modes, enter the password screen and input the letter "G" 110 times and for the 10 remaining spaces, enter the very first Japanese character (top-left). Now hit End and you'll be able to play with the Hidden Monsters Team.

Select Pennant or Vs. Mode. Enter the password screen. Enter G 110 times and then the first Japanese character (at the top-left) for the ten remaining spaces. Select "End" to play as the Hidden Monsters team.

Choose Pennant Mode and a 130 Days game. Then pick the Taiyo Whales, which is the 4th team from the top. Now, at the score screen where it says "Pennant Race", press the following buttons: