The following are known Action Replay Codes for 2020 Nen Super Baseball on SEGA Genesis / Mega Drive (Genesis).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay

• Strikes Modifier
  FF9940:XX
• Balls Modifier
  FF9941:XX
• Outs Modifier
  FF9941:XX
• Team 1 Score Modifier (P1)
  FF9944:XX
• Team 2 Score Modifier (P2/CPU)
  FF9945:XX
• Team 1 Has Max Money
  FF864A:99
  FF864B:99
  FF864C:99
  FF864D:99