The following cheat codes are for Alien 3 on Sega Genesis.
| CHEAT CODES |
|---|
| Follow the directions listed with each code. |
| Unlock Level Skip - Enter using controller 2 in options | bttnC, dpadUp, dpadRight, dpadDown, dpadLeft, bttnA, dpadRight, dpadDown |
| Use Level Skip - Pause the game | bttnC, bttnA, bttnB, bttnStart |
The following cheat codes are for Alien 3 on Nintendo Entertainment System.
| CHEAT CODE |
|---|
| Pause the game and enter the code. The game might crash if you enter the code on the last boss. |
| Stage Skip | dpadLeft, dpadRight, dpadUp, dpadDown, dpadLeft, dpadRight, bttnA, bttnB, bttnA, bttnB |
The following cheat codes are for Alien 3 on Super Nintendo Entertainment System.
| CHEAT SET 1 |
|---|
| Start the game and press bttnA + bttnB + bttnY + bttnX on controller 2. Press bttnA on controller 1 to start the count. Press bttnA + bttnB + bttnY + bttnX on controller 2 again, then press bttnB or bttnX to increase the number to match the cheat you want to enable. |
| All Codes Activated | 7 |
| Invincibility | 3 |
| Invincibility | 1 |
| No Damage | 2 |
| Unlimited Weapons | 4 |
| Unlimited Weapons and Invincibility | 5 |
| Unlimited Weapons and No Damage | 6 |
| LEVEL PASSWORDS |
|---|
| Enter the following codes as passwords. |
| Ending | OVERGAME |
| Level 02 | QUESTION |
| Level 03 | MASTERED |
| Level 04 | MOTORWAY |
| Level 05 | CABINETS |
| Level 06 | SQUIRREL |