DFA0-670D Start with 1 life on the ground instead of 5
D7A0-670D Start with 3 lives on the ground
D5A0-670D Start with 7 lives on the ground
DBA0-670D Start with 9 lives on the ground
C2E0-6F0D Infinite lives on the ground
DF68-DDAD Start with 1 life in the air instead of 5
D768-DDAD Start with 3 lives in the air
D568-DDAD Start with 7 lives in the air
DB68-DDAD Start with 9 lives in the air
C26C-6F08 Infinite lives in the air
DDE7-6F6D Start with 0 grenades and darts instead of 10
D9E7-6F6D Start with 5 grenades and darts
FBE7-6F6D Start with 25 grenades and darts
74E7-6F6D Start with 50 grenades and darts
17E7-6F6D Start with 99 grenades and darts
DDA9-640D + CEE7-64AD Start with 0 darts instead of 10
D9A9-640D + CEE7-64AD Start with 5 darts
FBA9-640D + CEE7-64AD Start with 25 darts
74A9-640D + CEE7-64AD Start with 50 darts
17A9-640D + CEE7-64AD Start with 99 darts
C22A-6FBC Infinite grenades
C227-DDF8 Infinite darts
C23D-6FBC Hearts worth 0
CE2B-D4B6 Infinite health--but you can still be hurt by some things
DD34-679C Large red grenade worth 0 instead of 5
DC34-679C Large red grenade worth 10
F034-679C Large red grenade worth 20 
F334-679C Large red grenade worth 30
4634-679C Large red grenade worth 40
3C3A-ADFC Small silver grenade worth 0 instead of 1
CBAC-6D0D + DFAC-6D6D Start on level 3
CBAC-6D0D + D4AC-6D6D Start on level 5
CBAC-6D0D + D7AC-6D6D Start on level 7
CBAB-67AD + D0AC-6DDD + 6DAC-6D0D Start on level 3, part 2
CBAB-67AD + D9AC-6DDD + 6DAC-6D0D Start on level 5, part 2
CBAB-67AD + D1AC-6DDD + 6DAC-6D0D Start on level 7, part 2
CBAB-67AD + D5AC-6DDD + 6DAC-6D0D Start on level 3, part 3
CBAB-67AD + D6AC-6DDD + 6DAC-6D0D Start on level 5, part 3
CBAB-67AD + DBAC-6DDD + 6DAC-6D0D Start on level 7, part 3