In your virtual game, what are the rules?
What are the players allowed to do to each other and what is prohibited?
In contrast to the games in the solid universe, which physical limitations does your game not have?
Which freedoms do you want for your players, so that the game is real fun?
Do the characters in your game need to go to work?
Do they need to eat (and use the toilet) ?
Would you want your game to have a learning effect for the players, so that they can use their experiences in their solid-world’s life?
If so, what would you want them to learn?