How do I get the good ending?

From what I have seen you have to stand around for a while and step inside the 3 things at the top. Also you have to stand on the springtrap/salvage suit itself. That is only a theory from what I have seen in others videos.

A Youtuber did a very detailed explanation of how to get the Good ending and all the minigames. I haven't tried this myself (I don't own the game) but it seems to explain how to get it.

Was posted on Kotaku with the title 'How to get the good ending", so I guess it works.

http://kotaku.com/how-to-get-the-good-ending-in-five-nights-at-freddys-3-1689420840