188.22

Released - 24 July 2015
 * You can now properly see the Non-Dedicated Multiplayer Sessions within the "Non-Dedicated Multiplayer Session" filter type ;)
 * Non-Dedicated Multiplayer Session Hosts no longer require opening ports! It now uses automatic Steam NAT Traversal! Note that you will not be able to see Non-Dedicated Multiplayer Sessions from prior to v188.21, so please update to this version if you want to play a Non-Dedicated Multiplayer Session with your friends.