The following are known Action Replay Codes for Alex Kidd in Shinobi World on SEGA Master System.

• Infinite Hits
  00C2-2E03
• Infinite Lives
  00C2-2F09
• Get Hit Once For Invincibility
  00C2-28FF
  Note: Do realize that when using this code you cannot pickup items while it is active.
• Have Weapon
  00C2-2C??
  Modifiers
  • 01: P-Power Up
  • 02: Knife Power Up
• Moon Jump
  00C2-2300
• One Hit Kills Bosses
  00C3-1E01
  Note: Only turn this code on when you are fighting a boss.