So far I am making a single rpg game. Its a option to use a server. But you do need to connect to the Atavism server for license checks and updates. That's what I was told by the moderator. You can add any assets,terrains,textures,characters you want to import. You can customize everything including scripts. I have alot of assets i imported along with Atavism software. Also if you want to have it on a server as a single rpg game. You can change the server settings.