Alien Storm (Genesis)

Credits Select
When you enter the options menu, press Up, Down, C, Down, B, B, B, Up, C (just one of many possible combinations - see the Notes page for more details). Now press Start to return to the main menu. Next, enter the Sound Test. Press Start to exit. Enter the options menu again and a new entry is added to change the amount of credits.

Wii Virtual Console version
The "+" on the First Aid Kit is a an "H".