When you pick an item up, you can make it reappear by going into a nearby elevator and then exiting back into the corridor. The item will be in the same place again. By repeating this process you can build up a significant supply of weapons. You must kill all Cyborg Chiefs before you can leave an area. Shield Thick black lines represent walls in the middle of a floor.
Gray areas represent dark floors.
The Lower Cyborgs are easiest to beat using either the psycho or normal punch, even if you come back to Area A after gaining the other weapons. Move in close and punch when they jump. The Cyborg Chiefs will cost you a lot of life unless you attack them with the psycho punch. Three hits will finish them off. Attack quickly because once they fire, the psycho punch will be blocked by their flying projectiles.