The games unlock all the secrets of the universe, I'm very glad you're learning but you haven't found them all... Keep on searching.
Truthfully though a 4th game was in the making back in late 2018 but I got a copyright strike in early production lol
I do have an almost finished FNaTaB 3 update still silently sitting on my drive so maybe something will happen soon... (It contains a very difficult post custom night mode).
- love, Koonggames, creator of a FNaF fangame with the best graphics of them all