The following are known Game Genie Codes for Extra Bases on Nintendo Game Boy.

• 000-0BE-3BA
  Outs are not counted
• 000-7AB-3BA
  Strikes are not counted
• 000-8BB-3BA
  Balls are not counted
• 00B-91A-19A
  Opponents cannot score (Switch off when you are batting so you can score)
• 01F-D6F-E66
  1 strike and you are out
• 02F-D6F-E66
  2 strikes and you are out
• 01F-F0F-E66
  1 out and the side is retired
• 02F-F0F-E66
  2 outs and the side is retired
• 01F-C0F-F7A
  1 ball and you walk
• 02F-C0F-F7A
  2 balls and you walk