The following are known Code Breaker Codes for Gradius Galaxies on Nintendo Game Boy Advance (GBA).

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

• Master Code – Must Be On
  0000C984 000A
  10000914 0007
• Invincible
  83004D90 0001
• Infinite Lives
  83004D46 0009
• Quick Score Gain
  83004D3C FFFF
• Max Score
  83004D3C 423F
  83004D3E 000F
• Super Speed Space Ship
  33004D9D 0004
• Have All Powerups
  83003A26 0000
  33004DA8 0007
• Always Full Shield
  33005984 0009

Manual Mode Codes

• Press Select For Speedup Option
  74000130 03FB
  33004DA8 0001
• Press Select+Up For Missiles Option
  74000130 03BB
  33004DA8 0002
• Press Select+Down For Double Option
  74000130 037B
  33004DA8 0003
• Press Select+Left For Laser Option
  74000130 03DB
  33004DA8 0004
• Press Select+Right For Muliple Option
  74000130 03EB
  33004DA8 0005
• Press Select+Left Trigger For Shield Option
  74000130 01FB
  33004DA8 0006
• Unlock Stages (Easy)
  83004C88 FFFF
  83004C8A FFFF
• Unlock Stages (Normal)
  83004C8C FFFF
  83004C8E FFFF
• Unlock Stages (Hard)
  83004C90 FFFF
  83004C92 FFFF
• Unlock All Stages
  43004C88 FFFF
  00000006 0002

Start On Stage Codes

• Stage 1-2
  73004D1C 0000
  33004D1C 0001
• Stage 1-3
  73004D1C 0000
  33004D1C 0002
• Stage 1-4
  73004D1C 0000
  33004D1C 0003
• Stage 1-5
  73004D1C 0000
  33004D1C 0004
• Stage 2-1
  73004D1C 0000
  33004D1C 0005
• Stage 2-2
  73004D1C 0000
  33004D1C 0006
• Stage 2-3
  73004D1C 0000
  33004D1C 0007
• Stage 2-4
  73004D1C 0000
  33004D1C 0008
• Stage 2-5
  73004D1C 0000
  33004D1C 0009
• Stage 2-6
  73004D1C 0000
  33004D1C 000A
• Stage 3-1
  73004D1C 0000
  33004D1C 000B
• Stage 3-2
  73004D1C 0000
  33004D1C 000C
• Stage 3-3
  73004D1C 0000
  33004D1C 000D
• Stage 3-4
  73004D1C 0000
  33004D1C 000E
• Stage 4-1
  73004D1C 0000
  33004D1C 000F
• Stage 4-2
  73004D1C 0000
  33004D1C 0010
• Stage 4-3
  73004D1C 0000
  33004D1C 0011
• Stage 4-4
  73004D1C 0000
  33004D1C 0012
• Stage 4-5
  73004D1C 0000
  33004D1C 0013
• Stage 4-6
  73004D1C 0000
  33004D1C 0014
• Stage 5-1
  73004D1C 0000
  33004D1C 0015
• Stage 5-2
  73004D1C 0000
  33004D1C 0016
• Stage 5-3
  73004D1C 0000
  33004D1C 0017
• Stage 5-4
  73004D1C 0000
  33004D1C 0018
• Stage 5-5
  73004D1C 0000
  33004D1C 0019
• Stage 6-1
  73004D1C 0000
  33004D1C 001A
• Stage 6-2
  73004D1C 0000
  33004D1C 001B
• Stage 6-3
  73004D1C 0000
  33004D1C 001C
• Stage 6-4
  73004D1C 0000
  33004D1C 001D
• Stage 7-1
  73004D1C 0000
  33004D1C 001E
• Stage 7-2
  73004D1C 0000
  33004D1C 001F
• Stage 7-3
  73004D1C 0000
  33004D1C 0020
• Stage 7-4
  73004D1C 0000
  33004D1C 0021
• Stage 7-5
  73004D1C 0000
  33004D1C 0022
• Stage 8-1
  73004D1C 0000
  33004D1C 0023
• Stage 8-2
  73004D1C 0000
  33004D1C 0024
• Stage 8-3
  73004D1C 0000
  33004D1C 0025
• Stage 8-4
  73004D1C 0000
  33004D1C 0026
• Stage 8-5
  73004D1C 0000
  33004D1C 0027
• Stage 8-6
  73004D1C 0000
  33004D1C 0028
• Stage 8-7
  73004D1C 0000
  33004D1C 0029
• Stage 8-8
  73004D1C 0000
  33004D1C 002A
• Stage 8-9
  73004D1C 0000
  33004D1C 002B
• Stage 8-10
  73004D1C 0000
  33004D1C 002C
• Stage 8-11
  73004D1C 0000
  33004D1C 002D
• Stage 8-12
  73004D1C 0000
  33004D1C 002E
• Bonus Stage
  73004D1C 0000
  33004D1C 0030