The following are known CodeBreaker Codes for Contra Advance: The Alien Wars EX 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
  0000D66C 000A
  1004A68C 0007
• Infinite Lives P1
  33002C60 0063
• Quick Score Gain P1
  83002C64 FFFF
• Max Score P1
  83002C64 E0FF
  83002C66 05F5
• Infinite Continues
  33001A84 0063
• Press Select+Up For Spread
  74000130 03BB
  33002CA8 0001
• Press Select+Down For C Missiles
  74000130 037B
  33002CA8 0002
• Press Select+Left For Homing Missiles
  74000130 03DB
  33002CA8 0003
• Press Select+Right For Flamethrower
  74000130 03EB
  33002CA8 0004
• Press Select+L Trigger For Laser
  74000130 01FB
  33002CA8 0005
• Press Select+R Trigger For Tank Missile
  74000130 02FB
  33002CA8 0006
• Invincibility
  33002CA0 0063
  Note: With this code, you can still die if you fall out of the screen and/or into the lava.

Start on Level Codes

• Level 2
  73001A6C 0000
  33001A6C 0001
• Level 3
  73001A6C 0000
  33001A6C 0002
• Level 4
  73001A6C 0000
  33001A6C 0003
• Level 5
  73001A6C 0000
  33001A6C 0004