a few more multiplayer modes i thought of:
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Syren Sisters **- 3 demon ghost sisters are on hunt for a special aritifact…They need the artificat to become stronger and more powerful so once one of the sisters retrieve it…The Round becomes 1000x times tougher…Once they get the artifact a short animation will appear showing the ghosts grow in size, and ferocity,It wil take PRECISE and Perfect Teamwork now that they have the orb. But the sisters will now have a Clear advantage in speed.. 
The stage is a dark and scary museum with multiple floors and the artifact is repositioned after every round…picture the artifact as a small yet brillantly illuminated green orb
The ghostbusters have to try and catch all the sisters beore one of them reaches the artifact and become more powerful…They ghostbusters can even locate the artifact themselves with the PKE. pick it up and try to hide with the artifact, or try to outrun the syrens while the other GB’s capture them
The syren sisters are very powerful and require significant damage from both the slime blowers and proton packs to be wrangled and trapped successfully. :angryvigo: :vinzclortho:
**
Posession** - Assuming that this will be over xbox live with 4vs 4 or 5vs 5 combat
I was thinkin that 1 team can be the true ghostbusters and the other team could be possesive ghosts…
Now each level would have certain items that the ghosts could “possess”
examples: Stoves,cars, books,firetrucks, electrical boxes, bathtubs etc
Each of those items would have give the ghost an item specific ability like the stove would belch fire the cars would be drivable to try and run over the Gb’s The electrical boxes would shoot out bolts of electricity,
The Gb’s would have to deal with the item they possessed first and then deal with the ghost! 
Also!! My favorite part…Say the ghost knocks you down repeatedly, the ghost can even possess you!! Remember Ray possessed in GB2??? Think of that!! As a corrupt Gb you can release your fellow ghost members from traps, sabotage the Gb’s equipment ( temporaily),and even knock out the Gb’s with a Vigo like energy Breath thing lol
I really hope Sierra comes up with a kick ass multiplayer mode :walterpeck:
I thought of another mode called **Trap Man **where one person in the group is in charge of all the traps 
while the team tries to locate, bust, and trap ghosts…the trap man has to keep track of which traps are full and which are empty…The ecto-1 will serve as a portable containment unit and will be where the trap man can empty the full traps,..then he sprints back and forth to hand the guys fresh traps and picks up more full ones…If a full trap is unattended for too long the ghost will escape…Communication through the team and the trap man is essenital to beat the ghosts
just my silly idea 
Can u guys think of any cool multiplayers modes??? :sigh: