The following are known CodeBreaker Codes for Defender of the Crown on Nintendo Game Boy Advance (GBA).

The codes should work with the region specified but may work for other regions as well.

• Master Code – Must Be On
  92BD7FEF 4605
  20E21DB0 B77A
  10384092 FFF6
• Infinite Cash
  1D7241F3 BA7B
• Infinite Health (1 On 1 Combat)
  E4C378E3 BF9D
  D51865F9 9B6B
• Weak Enemies (1 On 1 Combat)
  A4E37866 BF9D
  9C73315C 9E75
• Infinite Boulders
  AFE22E66 B0EB
• Infinite Greek Fires
  EFC22EE3 B0EB
• Infinite Diseases
  63884A83 B5F6

Artillery Home Codes

• 999 Soldiers
  2DACC9D2 7AF7
• 999 Knights
  1D76C4D8 5A73
• 999 Catapults
  0D66C5DA 5AF3

Artillery Campaign Codes

• 999 Soldiers
  FB9CEF2F 5A1A
• 999 Knights
  EB8CEE2D 5A9A
• 999 Catapults
  DB56E327 7A1E