The Real Ghostbusters

The Real Ghostbusters puts you in the role of a ghost hunter clearing ten levels filled with spirits. You first weaken the ghosts with your gun, then use the proton beam to suck them into your backpack for storage. Along the way, you can collect beam recharges, improved firepower, or a shield. Slimer also appears as a power-up, floating around you and instantly taking out ghosts on contact. Step by step, you battle through the waves of hauntings until the city is safe again.