The following are known Code Breaker Codes for Oni on Sony Playstation 2 (PS2).

These codes are for the U.S. version of the game.

• Master Code – Must Be On
  FA7A006E 32AF9BD5
• Have Easy Kills
  0A5134A4 00000001
• Have Guage Info
  0A8F34D2 00000001
• Infinite Ammo
  0A1F7E70 00000063
• Infinite Health
  1A597886 00000190
• Infinite Hypos
  0ABF7E76 00000004
• Invisible
  1ADB7887 0000FFFF