Is there a way to test for Guests in a script?

I know that there's someway to do that, but i don't know how.

Psuedo code I want to find out how to do:

If there is a guest in Players
Teleport them to the Guest area
end

To perfect magiccube3's answer, the Guest actually have a Negative id, here is an example code.

game.Players.PlayerAdded:connect(function(player)
        if player.userId < -1 and player.Name:sub(1,6)=="Guest " then -- if a user has at least the name guest then it sets the player as a guest.
        --code
    end
end)