Space Invaders '91.
 No.  Code  Effect
   1  AE3A-AAEW  Start with 1 shield on 1st credit
   2  AN3A-AAEW  Start with 3 shields on 1st credit
   3  A63A-AAEW  Start with 7 shields on 1st credit
   4  BE3A-AAEW  Start with 9 shields on 1st credit
   5  AE6T-AAF8  Start with 1 shield instead of 5 after continue
   6  AN6T-AAF8  Start with 3 shields after continue
   7  A66T-AAF8  Start with 7 shields after continue
   8  BE6T-AAF8  Start with 9 shields after continue
   9  AJ9T-AA60+BBAT-AA86  Almost infinite shields
 10  9T3A-BGMY + 963A-AAD2 + AE3A-AAD0  Start at Round 2: Milky Way
 11  9T3A-BGMY + 963A-AAD2 + AJ3A-AAD0  Start at Round 3: Merutas
 12  9T3A-BGMY + 963A-AAD2 + AN3A-AAD0  Start at Round 4: Planet Dufa
 13  9T3A-BGMY + 963A-AAD2 + AT3A-AAD0  Start at Round 5: Moon
 14  9T3A-BGMY + 963A-AAD2 + AY3A-AAD0  Start at Round 6: Planet Venus
 15  9T3A-BGMY + 963A-AAD2 + A23A-AAD0  Start at Round 7: Planet Solaia
 16  9T3A-BGMY + 963A-AAD2 + A63A-AAD0  Start at Round 8: Planet Lisubi
 17  9T3A-BGMY + 963A-AAD2 + BA3A-AAD0  Start at Round 9: Planet Guraivas
 18  9T3A-BGMY + 963A-AAD2 + BE3A-AAD0  Start at Round 10: Planet Mars
 19  9T3A-BGMY + 963A-AAD2 + BJ3A-AAD0  Start at Round 11: Planet Mercury
 20  9T3A-BGMY + 963A-AAD2 + BN3A-AAD0    Start at Round 12: Planet Aluga
 21  9T3A-BGMY + 963A-AAD2 + BT3A-AAD0  Start at Round 13: Planet Laia
 22  9T3A-BGMY + 963A-AAD2 + BY3A-AAD0  Start at Round 14: Planet Bailam
 23  9T3A-BGMY + 963A-AAD2 + B23A-AAD0  Start at Round 15: Planet Daruta
 24  9T3A-BGMY + 963A-AAD2 + B63A-AAD0  Start at Round 16: Planet Lamusa
 25  9T3A-BGMY + 963A-AAD2 + CA3A-AAD0  Start at Round 17: Planet Ikuru
 26  9T3A-BGMY + 963A-AAD2 + CE3A-AAD0  Start at Final Round: Doriasta
 27  GBRA-AABR  Super crusher lasts 30 seconds
 28  BFRA-AABC  Use hyper laser 9 times
 29  ABRA-ATBG  Buster laser has 800 energy
 30  JBRA-AABE  Use homing bombs 40 times