How to Change Scene in Unity while running? -- Unity

For Changing existing Scene.

First way:

Step1:

Create Scene.

Step2:

Select File->Build And Run

Step3:

Then Add all scene into "Scene In Build" through clicking "Add Open Scenes".

Step4:

Click "Build" or "Build And Run".

Step5:

Write a script.

using

UnityEngine.SceneManager.SceneManagement.LoadScene(string SceneName)

where SceneName is the name of scene in Hierarchy.

I usually write

using UnityEngine,SceneManager;

...

SceneManagement.LoadScene(string SceneName);

Step6:

Attach a script to an empty object

Step7:

Run it. That's done.

[NOTE]

(1)It can used in play mode.

If not used in play mode, an exception will be thrown.

For more details on:

Unity Setting