Step by Step How to run demo multiplayer games in unity3D

Okay, below is the step to show how multiplayer games run on unity

Step1: open unity3D

Step2: open asset store

Step3: search for "Photon unity networking" in asset store, and import the package
(optional -> search for "18 free substances" and import some material for your project)

Step4: Under Assets-> Photon Unity Networking -> Resources -> PhotonServerSetting
Choose:

Hosting: Photon Cloud

Region: USA

(make sure you created account at)
https://www.exitgames.com/en/Account/SignIn

App ID: (copy from your exitgames dashboard)

Protocol: UDP


Step5: open one of the demo scene, then on top, File -> Build Setting -> build into .exe file for your mac or pc

Step6: now you should be able to play multiplayer games by opening 2 or 3 window