the ports I mentioned above are just examples, and yes, I have those ports already listed on the alias page.
the ones that you also posted is for steam, dota 2 have these ports according to: http://dev.dota2.com/showthread.php?t=15261
What protocol and ports does Dota 2 use?
Dota 2 uses the UDP protocol and communicates on ports 27015 through 28999 to our dedicated servers. By default, your client opens UDP port 27005 or your computer to connect to the game servers.
and I have added them also and all is working great for dota 2…, just need some other games which does not post their port(s) on their websites :(
but anyways, for my other games, I'll just add the port(s) accordingly and reboot pfsense if needed.