The following are known GameShark Codes for MLB 98 on Sony Playstation (PS1).

• Infinite Strikes
  800B34D2 0000
• 1 Strike And You Are Out
  D00B34D2 0000
  800B34D2 0002
• 2 Strikes And You Are Out
  D00B34D2 0000
  800B34D2 0001
• Infinite Balls
  800B34D4 0000
• 1 Ball And You Walk
  D00B34D4 0000
  800B34D4 0003
• 2 Balls And You Walk
  D00B34D4 0000
  800B34D4 0002
• 3 Balls And You Walk
  D00B34D4 0000
  800B34D4 0001
• Infinite Outs
  800B34D0 0000
• 1 Out And You Are Out
  D00B34D0 0000
  800B34D0 0002
• 2 Outs And You Are Out
  D00B34D0 0000
  800B34D0 0001
• FAKE Infinite Stamina Home Team Pitcher
  800B34AC 0064
• FAKE Infinite Stamina Away Team Pitcher
  800B34AE 0064
• Infinite Stamina Home Team Pitcher
  800B34C2 0064
• Infinite Stamina Away Team Pitcher
  800B34C6 0064
• Score Modifier Home Team
  300121B5 00??
• Score Modifier Away Team
  300121F7 00??
• Both Team Run’s Score Modifier
  8005C974 00??

Player Creation Code

• MAX Power
  301C89CA 0064
• MAX Average
  301C89CB 0064
• MAX Speed
  301C89CF 0064
• MAX Arm
  301C89D0 0064
• MAX Fielding
  301C89D1 0064
• MAX Jumping
  301C89D2 0064
• Infinite Points in Pool to Create
  8018F292 00C8

Pitcher Creation Codes

• MAX Speed
  301C9287 0064
• MAX Arm
  301C9288 0064
• MAX Accuracy
  301C9289 0064
• MAX Break
  301C928A 0064
• MAX Fielding
  301C928B 0064
• MAX Jumping
  301C928C 0064
• Infinite Points in Pool to Create
  8018F1C2 00C8