Why is Springtrap's Night named FNaF 3 in game?

Me:

They're all here!

For those wh0 likes classics!

SINGULARITY - UNTITLED FNAF FAN GAME - OST

Minecraft: Combat Evolved (WIP)

remember, December 23

Radioactive FEET

If the game will go well I may consider making a sequel in the future.

I tried draw it… see. One like one

Does anybody know the name of this game?