The player controls a knight named Sir Arthur, who must defeat zombies, giants (referred to as "big men"), demons, cyclopes, dragons, and other monsters to rescue Princess Prin-Prin, who has been kidnapped by Astaroth (also called the Devil or Great Satan, to distinguish him from another boss demon named Satan), king of Demon World. Along the way, the player can pick up new weapons, bonuses, and extra suits of armor that can help in this task.[7]
The player can only be hit twice before losing a life, which results in having to restart the level, or starting at the checkpoint if the player has reached it. Furthermore, the player will lose a life if a level is not completed within a set time limit. After defeating the final boss (The Devil), the player must then replay the entire game on a higher difficulty level to reach the genuine final ending.[8]