What? Did you mean like a LAN network? Where you can play ONLY WITH people on your wifi?
If you meant by playing in wifi w/ your friends in your home, then it's a no and a yes.
You can use your wifi to play in multiplayer with your friends BUT you can't make a private match for your friends to be in. You will be mixed in the global multiplayer, there's no way to make it a local.
Yep, local WiFi like Asphalt 8's is NOT available in Six Guns.