The following are known CodeBreaker Codes for Duel Masters: Kaijudo Showdown 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
  00000000 0002
  101652B8 0007
• Walk Through Walls
  830008C8 0010
• Infinite Money
  830043BC FFFF
• Max Money
  830043BC E0FF
  830043BE 05F5
• Have All Cards
  430043C2 6262
  00000096 0002
• Have All Preset Decks
  43004542 0101
  00000004 0002
• Max Passes
  330041C0 00C8
• Have All Cool Stuff
  430041C2 FFFF
  00000014 0002
• Have All Artifacts
  430041EE FFFF
  00000003 0002
  Note: This code will make the game progress to the end if you answer an email marked with an !.
• Start Duel With 2 Mana
  730015C8 0000
  830015C8 0200
• Tap R To Summon With No Sacrifices
  74000130 02FF
  E3001458 0001
  33001459 0001
  73001458 010A
  83001458 0101
  Note: Keep tapping the R button slowly until it summons the monster. Also don’t summon more than 2 monsters per turn.
• Press L+R For Enemies Have No Shields
  74000130 00FF
  330016A5 0000
• Infinite Shields
  33001679 0005