When you create a game you have 3 options with tick boxes:

Ranked
Private
Allow Guests

As i understand the concept of tick boxes; if you tick the box "Ranked" then the game is ranked. So if you do not tick the box "Allow Guests" then guests shouldnt be allowed. However i think this has been programmed the wrong way round!

i havent had a problem with it, never tried it without guests so maybe its guests either way, i heard someone else had this issue also.

im sure it will be fixed soon though.

Well every game i've created in the last month i've not ticked to allow guests but they've joined every single time!

maybe its allow guests to watch as im not sure that guests can watch games : S?

guest join my game ticked or not but are still able to watch, so possible nick may have this wrong!