AFAA-AAFY Start with 1 life
BFAA-AAFY Start with 9 lives
EZAA-AAFY Start with 25 lives
LBAA-AAFY Start with 50 lives
XFAA-AAFY Start with 99 lives
REXT-A6YR Infinite lives
AAXA-AAC8 Start with no grenades
BEXA-AAC8 Start with 9 grenades
XEXA-AAC8 Start with 99 grenades
XEXA-AWC8 Start with 999 grenades
AAXA-AADE Start with zero mines
BEXA-AADE Start with 9 mines
XEXA-AADE Start with 99 mines
XEXA-AWDE Start with 999 mines
AAXA-AADL Start with no power lines
BEXA-AADL Start with 9 power lines
XEXA-AADL Start with 99 power lines
XEXA-AWDL Start with 999 power lines
ABBA-AAAJ Start with no buzzsaws
AFBA-AAAJ Start with 1 buzzsaws
BFBA-AAAJ Start with 9 buzzsaws
AJZT-AA6L Infinite buzzsaws
ABGT-EWFT Start 1st level timer at 900
BAXA-BA4T Time goes by faster
AECA-AAHY Start with 1 continue
A2CA-AAHY Start with 6 continues
BECA-AAHY Start with 9 continues
AJ6T-AA7L Infinite continues
BAHT-BA2G Each crystal worth 8 instead of 1
C2HT-BA2G Each crystal worth 16 instead of 1
C2YA-AA64 Infinite energy
AALA-AAEL Always shoot grenades instead of bullets
AALA-AAEY Always shoot power lines instead of bullets
BAHA-BA88 Each grenade token worth 8
EAHA-BA88 Each grenade token worth 20
BAHA-BA9G Each mine token worth 8
EAHA-BA9G Each mine token worth 20
BAHA-BA9R Each power line token worth 8
EAHA-BA9R Each power line token worth 20
RFZT-A604 Makes the Gauntlet easier to defeat
RF5A-A6W8 Makes Dead Head easier to defeat
RGHA-A60Y Makes Trash Monster easier to defeat
RGDA-A6VT Makes Mother Fish easier to defeat
BAZA-AA2G Force field lasts until the next level (after you get a force field token)
SECA-BEXR Start in world 1, level 1.2
SECA-BJXR Start in world 1, level 1.3
SECA-BNXR Start in world 2, level 2.1
SECA-BTXR Start in world 2, level 2.2
SECA-BYXR Start in world 3, level 3.1
SECA-B2XR Start in world 3, level 3.2
SECA-B6XR Start in world 3, level 3.3
SECA-BAXR Start in world 4, level 4.1
AJCA-AA5J + 9TCA-BGMN + BECA-AADR Start in world 4, level 4.2
AJCA-AA5J + 9TCA-BGMN + BJCA-AADR Start in world 4, level 4.3
AJCA-AA5J + 9TCA-BGMN + BNCA-AADR Start in world 5, level 5.1
AJCA-AA5J + 9TCA-BGMN + BTCA-AADR Start in world 5, level 5.2
KJXA-BLZ0 + KEXA-BLZ2 Infinite time, grenades, mines, and power lines
ANMT-BT6Y + REMT-A6Y0 Shoot multiple shots instead of single