Hi, I want to make Multiplayer Online game but I have 1 question…
Does It cost something or is it free?
At the very least you will need your own web server.
Here’s the differences between Unity Licenses
You can definitely make a multiplayer game for free and without without a server, and with the free version of unity, to boot.
Check out the official networking demo project here
I’ve fiddled around with multiplayer before, and its not for novices.
I made a multiplayer FPS game, by using this tutorial; http://forum.unity3d.com/threads/75385-Ultimate-Unity-Networking-project-Add-multiplayer-to-your-game-today!
Its not free, but its easy to understand and very well documented.