You are trapped in a seven-level mansion with 144 rooms on each level that are packed with monsters and treasure. Each level has a different surround to the rooms and progressively more dangerous monsters.
On each level you have to get the porcupine bombs so as to move to the next level and you are directed to these by signposts in some of the rooms. The rooms contain diamond rings, coins, money notes and magic symbols.
There are four types of monsters each with different characteristics but they will all drain your energy if they bump into you or can be dispatched with your limited supply of bullets. These two can be replaced by finding the bottles or guns respectively.
The bombs are randomly spread around and can be used against monsters when they will send out a spray of bullets to destroy anything in the vicinity.