Game build question

Hi! I have a question VERY important.

When you make a game in Unity and the time comes to build it, you can choose to make a standalone for multiple platforms, right?

Okay, so the question is:
If anyone buy / download my game, that person will need the Unity Web Player installed to play it?

Also, I need some specific program to make a setup for the game or unity does it for me? Like, just put the folder build and it will be ready

The WebPlayer is only required for the old WebPlayer build. Back then users had to download the plugin to run the game in browser. This is no more required with the webgl build (it just ships a huge build…).

When you make standalone for PC/Mac/Linux, nothing is required as long as the user has not been screwing around too much and removed some vital libraries from his computer.

You do not need anything to build a standalone build. For Android and iOS, there are some additional restrictions and libraries needed. For standalone, it goes as is.