The following are known Code Breaker Codes for LEGO Knights’ Kingdom on Nintendo Game Boy Advance (GBA).

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

• Master Code – Must Be On
  00005E09 000A
  100AB820 0007
• Infinite Weapon Bar
  3200F41A 0001
• Infinite Health
  3200F168 0063
• Unlock Everything
  42000F64 0101
  0000000B 0002
• Press L+R+Down To Play As Golden Knight
  74000130 007F
  3200F164 0005
• Press L+R+Up To Play As Vladek
  74000130 00BF
  3200F164 0004