Hammerin' Harry: Ghost Building Company is the sequel to Hammerin' Harry . This episode has Harry fighting more than just workers. He has to defeat an army of ghosts in a series of environments, including construction site, sewer, airship, jungle, and finally, the headquarters where he meets the evil ghost building machine. Rather than using his mallet, Harry can obtain a spiked ball which does more damage than the mallet. There are five stages, and each one ends with Harry fighting a boss.
The gameplay changes between beat-em-up and horizontal shooter. In the beat-em-up sections, Harry must fight enemies on screen. In the horizontal shooter sections, Harry flies through the air, defeating airborne enemies and avoiding dangerous objects.