Aliens 3 Cheats for SNES
To activate the cheat mode, press A, B, Y, X on controller two during game play.
Now you need to press A on controller one, this will get you a number displayed at the top left of the screen. The numbers correspond as follows:
1 - Invincibility
2 - No damage
3 - Invincibility
4 - Unlimited weapons
5 - Unlimited weapons and invincibility
6 - Unlimited weapons and no damage
7 - All cheats activated
Use your buttons and controller to toggle the various cheats.
To activate the level skip cheat, press C, Up, Right, Down, Left, A, Right, Down on controller two at the options menu. Now enter this sequence, C, A, B or C + A + B. A when the game is restarted you'll jump to the next level.
If you don't fancy using the cheat above, or you can't get it to work, then here are the level passwords.