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I honestly can't make sense of how to play this game. Does anyone have any tips? And is there a way to remove the shadows?

I beat 1987 and I didn't see anything. And what is the donut?

I have seen both of all the main character's animations, the golden freddy one, both naturally and via 6/9/6/9, but I am still stuck at 85%. What am I missing? 

Is there any place I can find some sort of guide for everything?