Hammerin' Harry: Ghost Building Company

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.

Upon completion of a stage, the gameplay switches from a beat-em-up to a horizontal shooter where Harry flies through the air, defeating airborne enemies and avoiding dangerous objects.