How to import game which is ready to unity editor?,How can I import game to Unity Editor?

I want to make a browser game from “Baldi’s Basics in Education and Learning”,I just want to make a browser game for my site. But I don’t know how to do it. Can somebody help me?

You can not import a built game made with Unity into Unity itself. The best you can do is export resources from game_Data\sharedassets(number).assets and scripts from game_Data\Managed\Assembly-CSharp.dll or Assembly-UnityScript.dll. I use UABE (Unity Asset Bundle Extractor) for resources (textures, sounds, music, etc) and dnSpy for scripts.