The following are known CodeBreaker Codes for Duel Masters: Sempai Legends 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
  00004C27 000A
  10019144 0007
• Start Duel With 2 Mana
  73001708 0000
  83001708 0200
• Infinite Shields
  330017B9 0005
• Press L To Have More Attacks For Your Monster
  74000130 01FF
  330015A5 0005
  Note: Only Press L when its your turn.
• Press L+R For Enemies Have No Shields
  74000130 00FF
  330017E5 0000
• Tap R To Summon With No Sacrifices
  74000130 02FF
  E30015A0 0001
  330015A1 0001
  730015A0 010A
  830015A0 0101
  Note: Keep tapping the R Button slowly til it summons the monster. Don’t summon more than 2 monsters per turn.
• Have All Cards
  4300522C 6363
  0000005A 0002
• Max Level
  83005220 967F
  83005222 0098
• Low Game Time
  83005224 0000
• 999 Wins,0 Losses
  83005228 03E7
  8300522A 03E7