How to play muck with friends and family (don’t use muck to bond with family)
1. Make muck lobby but don’t start.
2. Use shift+tab at the same time to open steam overview.
3. Go over to the friends area and look for the tiny arrow next to your friend’s name.
4. Choose “Invite to lobby”
5. Have your friend accept the invite.
6. Now it is just like a normal singleplayer game except you have a friend with you.
(Friends cannot start the game or change settings)