BackTrack - Gameboy Advance
All Weapons
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Press SELECT, L, RIGHT, B, L, R, LEFT. Then enter
weap at the password screen.
Auto Ammo
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Press SELECT, L, RIGHT, B, L, R, LEFT. Then enter
ammo at the password screen.
Invincibility
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Press SELECT, L, RIGHT, B, L, R, LEFT. Then enter
god at the password screen.
Cheats:
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At the Dark Side of the Moon Menu, press Select. Then press
L, Right, B, L, R, Left.
Enter the new Build Secret Base option, press A and enter any
of the following Codes:
GOD - Invincibility
WEAP - All Weapons
AMMO - Infinite Ammo
HEA - 200 Health Code
KEY - All keys
FRE - Freeze Enemies
ARM - Max Armor
MON - Radar Mode
COOR - Coordinates