A game with only invited friends

[Snakespeare]

So this morning a hint popped up in-game, and it answered a Frequently Asked Question. The answer was completely unexpected to me. It said that YOU CAN INVITE FRIENDS TO "Play Solo" GAMES. To me solo meant only one person in that session, but that's not what it means.

I just wanted to pass the hint on. I guess solo is a private instance and multiplayer is a public instance.