Alien Syndrome Action Replay Codes (USA)
This page contains the Action Replay codes that I have available for Alien Syndrome (USA), a game for the original NES (Nintendo Entertainment System). If you're playing on an emulator, you'll typically be able to put these codes into the program through a built in option. Anyone who is really old school and playing on a physical console will have to purchase a physical Action Replay device to use these codes.
If you don't see the code you want on this page, I recommend you return to my Alien Syndrome Guides Index and choose a different section.
Exits On All Stages Are Opened: 0405:00
Infinite Lives (Player 1): 04A1:09
Infinite Lives (Player 2): 04DA:03
Invincibility (Player 1): 049F:FA
For Invincibility codes switch F/X off to collect any icons and to exit stages
Invincibility (Player 2): 04D8:FA
Stop Timer: 03BE:33
Character Modifier: 04AB:??
Character Modifier - Ricky: 04AB:00
Character Modifier - Mary: 04AB:01
Stage "Round" Select: 03B4:??
Stage "Round" Select - Round 1: 03B4:00
Stage "Round" Select - Round 2: 03B4:01
Stage "Round" Select - Round 3: 03B4:02
Stage "Round" Select - Round 4: 03B4:03
Stage "Round" Select - Round 5: 03B4:04
Stage "Round" Select - Round 6: 03B4:05
Stage "Round" Select - Final Boss: 03B4:06