Star Two
This one is obtained by getting the second ending of the game, which also reveals a bit about the animatronics found in FNaF: Sister Location. The only problem is that obtaining this is pretty random, so don’t lose hope. A special mini-game has the chance to trigger upon your death. It may not happen the first time you die, so just keep losing until you come across the 2D mini-game that puts you in control of Baby. You’ll have to deliver cupcakes to each child located in the level quickly.
When done, an ice cream cone will appear just before the level’s end. Instead of going to the end, turn back and race to the very beginning of the level. If you make it back in time, you will see the second ending where Baby kills a young girl by snatching her into the animatronic’s storage tank.