Game Genie codes |
| 010-6FB-7FB | | Don't flash after getting hit |
| FF0-6FB-7FB | | Flash longer after getting hit |
| 052-B1B-E6E | | Get 5 smart bombs after you die |
| 092-B1B-E6E | | Get 9 smart bombs after you die |
| 007-E2C-19E | | Infinite smart bombs |
| 3EB-81B-4CA | | Invincible Contra: The Alien wars is a trademark of Konami (America) Inc. |
| 077-97B-E6A | | Start with Crush Gun |
| 017-97B-E6A | | Start with Flame Thrower |
| 087-97B-E6A | | Start with Homing shot |
| 097-97B-E6A | | Start with Spread shot |
Game Shark codes |
| 0109dbc1 | | Infinite Continues Submitted by supersonicjc |
| 0109d8c1 | | Infinite Lives Submitted by supersonicjc |
| 0109dac1 | | Infinite Smart Bombs Submitted by supersonicjc |
| 01fff2d6 | | Invincible Submitted by supersonicjc |