The following are known Game Genie Codes for Baseball Stars II on Nintendo Entertainment System (NES).

• trikes Do Not Count
  SZSSZSVV
• Balls Do Not Count
  SXSITKVV
• One Strike For An Out
  PAVIPILA
• Two Strikes For An Out
  ZAVIPILA
• Four Strikes For An Out
  GAVIPILA
• Five Strikes For An Out (Only 3 Show On Screen)
  IAVIPILA
• One Ball For A Walk
  PESSIGGA
• Two Balls For A Walk
  ZESSIGGA
• Three Balls For A Walk
  LESSIGGA
• Five Balls For A Walk
  IESSIGGA
• Six Balls For A Walk
  TESSIGGA
• Game Ends After 1 Inning
  PEXPVGLZ
• Game Ends After 2 Innings
  LEXPVGLZ
• Game Ends After 3 Innings
  TEXPVGLZ
• Game Ends After 4 Innings
  AEXPVGLX
• Game Ends After 5 Innings
  ZEXPVGLX
• Game Ends After 6 Innings
  GEXPVGLX
• Game Ends After 7 Innings
  TEXPVGLX
• Game Ends After 8 Innings
  AOXPVGLZ

Playing Against Human Player Codes

• One Out Per Side Instead Of 3
  PANILTLA
• Two Outs Per Side
  ZANILTLA
• Four Outs Per Side
  GANILTLA

Playing Against Computer Player Codes

• One Out Per Side Instead Of 3
  PAOAILLA
• Two Outs Per Side
  ZAOAILLA
• Four Outs Per Side
  GAOAILLA