You want these people,that they wanted join, to your game, into a virtual world full of adventures, that participation, in this.
In the first rail, these people, they, they should receive,open access, to content, the game itself. No, that they seeing it, on screen thrown (by me) above
You, No behind block them, game content that enters the server, and their characters created there.
They yes simply,they want have a good time, not seriously, but take a break from the real world (recharge the batteries and forget about everything else for a while).
They have, good fun.
Your server is no available. No possible to "visit".
Mentioned games