You cannot, however, there are special CO-OP maps specialized for it by the map creator, and only there can you be a Ghost. actually you can make a ghost in a custom map just do his character number 12 or you can use the advanced level editor
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Play plazma burst 2 on the official website....
go to the plazma burst 2 official website and click on custom maps in the tool bat
Actually you cant download PB2 you actually play it on a website. Type in Plazma Burst 2 and the webiste will pop up.
i dont no
Only if you are a Ghost you can get invisible. But it's automatic, you are invisible unless you are hit or take damage your allies are visible to you, and you are visible for them.