DD62-076D Start with 3 lives
DF62-076D Start with 4 lives
D462-076D Start with 5 lives
D062-076D Start with 7 lives
D962-076D Start with 8 lives
D162-076D Start with 9 lives
D562-076D Start with 10 lives
82BB-DD04 Infinite lives
EEB1-D7A4 2 lives after continue--player 1
DDB1-D7A4 3 lives after continue--player 1
DFB1-D7A4 4 lives after continue--player 1
D4B1-D7A4 5 lives after continue--player 1
D0B1-D7A4 7 lives after continue--player 1
D9B1-D7A4 8 lives after continue--player 1
D1B1-D7A4 9 lives after continue--player 1
D5B1-D7A4 10 lives after continue--player 1
EEB0-DDA4 2 lives after continue--player 2
DDB0-DDA4 3 lives after continue--player 2
DFB0-DDA4 4 lives after continue--player 2
D4B0-DDA4 5 lives after continue--player 2
D0B0-DDA4 7 lives after continue--player 2
D9B0-DDA4 8 lives after continue--player 2
D1B0-DDA4 9 lives after continue--player 2 
D5B0-DDA4 10 lives after continue--player 2
8284-AF03 Bonus life worth nothing
DD62-0F0D Start with 0 continues instead of 4
DF62-0F0D Start with 1 continue
D462-0F0D Start with 2 continues
D762-0F0D Start with 3 continues
D962-0F0D Start with 5 continues
D162-0F0D Start with 6 continues
D562-0F0D Start with 7 continues 
D662-0F0D Start with 8 continues
DB62-0F0D Start with 9 continues
C223-D78B Infinite continues (but if continue timer runs out and player 
starts, a credit gets used up)
6D65-6403 + DF65-6463 Once you get a mobile force field, you are invincible 
(the visible effect can wear off, but you still have invincibility)

Don't combine the next two codes

8283-67D7 Weapons gauge doesn't lose power until you die

6DB8-D404 + DFB8-D464 Don't lose weapon power upgrade when you die, 
and after you die, weapon power doesn't decrease until you get a new weapon

EEBF-D7A4 Player 1 joins in with 2 lives
DDBF-D7A4 Player 1 joins in with 3 lives
DFBF-D7A4 Player 1 joins in with 4 lives
D4BF-D7A4 Player 1 joins in with 5 lives
D0BF-D7A4 Player 1 joins in with 7 lives
D9BF-D7A4 Player 1 joins in with 8 lives 
D1BF-D7A4 Player 1 joins in with 9 lives
D5BF-D7A4 Player 1 joins in with 10 lives