There is a hidden board on a proboards site that I want to find, is there anyway of getting the url for it?

I've tried URL Hunter, url snooper and other softwares but it doesn't bring up the hidden urls of the board.

http://shadowallstars.proboards.com/index.cgi?board=

that's half the url, so I would need to find the name of the hidden board

It's hidden for a reason, and that's why you can't find it.

if its hidden you should find some word clues in that board whatever it is

You could try brute forcing "The Host" account, or wait till there is an exploit available.

Use a hammer and see if it behind the monitor screem and inside your monitor.