1. EABT-AA4W - Master code, must be entered
2. AB8A-AACW - Special attack uses no energy
3. AB8A-ANCW - Special attack uses 1/2 as much energy
4. R1DT-A60R - Normal attacks use no energy
5. P1DT-BD0R - Normal attacks gain energy instead of losing it
6. AA4A-BB96 - Start with maximum energy
7. AJ7A-AA3R - Infinite credits
8. AB9TCTE0 - Each energy unit is worth 2 times as much
9. AB9T-DAE0 - Each energy unit is worth 4 times as much
10. AB9T-CAN0 - Each energy unit is worth 8 times as much
11. 9WET-BCS4 + CWET-B998 + ACET-AGH6 - Start on Mission 2, Expel the Aliens
12. 9WET-BCS4 + CWET-B998 + ACET-ANH6 - Start on Mission 3, Alien's Nest
13. 9WET-BCS4 + CWET-B998 + ACET-A2H6 - Start on Mission 5, Save the Laboratory
14. 9WET-BCS4 + CWET-B998 + ACET-A8H6 - Start on Mission 6, Night Crawler
15. 9WET-BCS4 + CWET-B998 + ACET-BEH6 - Start on Mission 7, Destroy the UFO
16. 9WET-BCS4 + CWET-B998 + ACET-BLH6 - Start on Mission 8, Final Battle
17. ALXT-AA4Y - Most alien hits do no damage(no life lost on life meter)
18. AJEA-CA7R - Aliens in shooting gallery do no damage(no life lost on life meter)