Hey Vinz!
Well, my favorite GB game was Sega Genesis' (Mega Drive) Ghostbusters. You could choose Ray, Peter or Egon as your buster, each one having it's own special abilities. The gameplay was great: the scenarios were big and had lots of places to explore, not to mention the ghost-busting, almost identical to the movies. First you had to deal with 1 or 2 sub-bosses and then to the final Ghost (even the Stay Puft itself!), that, once beaten, his spirit starts to run away and your shot becomes the proton beam, and you have to capture it and activate the ghost trap to get it! The game was hard to beat but the ghost-boss fights were amazing and worth the effort. In the 2nd place, Sega Master System's Ghostbuster was my favorite. If you haven't tried Genesis Ghostbusters yet, i strongly suggest you to get an Emulator, the Rom and play it!
-Ramza-
“He Slimed me!”