Midnight Resistance.
 No.  Code  Effect
   1  AE2T-BA4A  Start at stage 2
   2  AJ2T-BA4A  Start at stage 3
   3  AN2T-BA4A  Start at stage 4
   4  AT2T-BA4A  Start at stage 5
   5  AY2T-BA4A  Start at stage 6
   6  A22T-BA4A  Start at stage 7
   7  A62T-BA4A  Start at stage 8
   8  BA2T-BA4A  Start at stage 9
   9  AA2T-AADL + JJ2T-AJDN  Start with 1 life
 10  AA2T-AADL + LJ2T-ALDN  Start with 8 lives
 11  AA2T-AADL + FA2T-AJDN  Start with 10 lives
 12  ABGA-AABN + JKGA-AJBR  Continue with 1 life
 13  ABGA-AABN + LKGA-ALBR  Continue with 8 lives
 14  ABGA-AABN + FBGA-AJBR  Continue with 10 lives
 15  CAWA-AA2Y  Infinite lives
 16  HXXA-FAC6 + AHXA-EAC8
 + HXXA-FBE4 + AHXA-EAE6		  Supply room items require 1 key each
 17  HXXA-FAC6 + AMXA-EAC8
 + HXXA-FBE4 + AMXA-EAE6  		  Supply room items require 2 keys each
 18  HXXA-FAC6 + A5XA-EAC8
 + HXXA-FBE4 + A5XA-EAE6		  Supply room items require 6 keys each  
 19  RHXA-E6XG + AMXA-EA64  All supply room items are free
 20  JGAT-EEVR  Infinite ammo for full-auto weapon
 21  JGAT-EEY2  Infinite ammo for 3-way weapon
 22  JGKA-EET4  Infinite ammo for flame thrower
 23  JGAT-EE1Y  Infinite ammo for shotgun
 24  JGBT-EEVJ  Infinite ammo for nitro weapon
 25  JGBT-EEYE  Infinite ammo for shower weapon
 26  JGAA-EEZJ  Infinite ammo for homing missile
 27  RHRA-E6T2  1-up worth 0 lives
With Codes 28 thru 30, keep in mind that the game won't allow more than 10 lives.
 28  JDRA-FJT2  1-up worth 2 lives
 29  JDRA-FYT2  1-up worth 5 lives
 30  JDRA-FAT2  1-up worth 8 lives
 31  AA2T-AADA + JJ2T-AJDC  0 continues
 32  AA2T-AADA + LJ2T-ALDC  7 continues
 33  AA2T-AADA + FA2T-AJDC  9 continues
 34  AVGA-AA34  Infinite continues