Welcome to the Castle of Doom, a place where monsters roam the corridors looking for helpless victims. Banished and all alone, you must escape this wretched castle of horror. In order to do so, you must maneuver the character through a series of screens and navigate the maze-like corridors.
Located on each screen are various exits that will lead to other portions of the castle; some screens feature multiple exits while others contain only one. Assorted monsters and androids haunt the screens, wandering around in random patterns. The number one rule of survival is to eliminate these creatures before they can do the same to you.
The lone character is armed with a pistol that can be used whenever monsters are on the screen. Creatures will be killed with one shot. Caution must be used, however, as some monsters move faster than others. There will also be times when enemies move towards the character from above, which can be particularly hazardous as you cannot fire the gun north or south; the pistol only fires to the right and left.
Because there are three lives allotted before the game starts, retreating off the screen may be a necessary strategy to survive. When a monster walks into the character, you'll lose a life. In addition to the creatures, the white-barred castle walls are deadly and will kill the lone gunman upon contact. ~ Matthew House, All Game Guide