There are several secrets to find as you explore the haunted pizzeria in Five Nights At Freddy's: Into The Pit. As you progress through the game, you can explore Jeff's Pizza to learn more about the broken arcade machines. By repairing them, you can earn stickers.
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These stickers may not seem like much, but they are essential if you want the perfect ending in Into The Pit. Getting these stickers can be tricky, and it will take some legwork to get through most of the game before you can start collecting them. You’ll want to make sure you have them as you head into the final night and attempt to save your dad in FNAF: Into The Pit.
The stickers are available from the Prize Machine in the arcade at Jeff's Pizza. The only way to get prizes from this machine is to find the missing part of it, which should be the Voucher Validator. You can find this while exploring the School in the second classroom. It will appear on the third night after you get the book from the principal's office. While you're working on this in Into The Pit, it will also help to focus on repairing all of the arcade machines, an important goal for the perfect ending and earning these stickers.
After you fix the Prize Machine, the next step is to fix the other arcade machines, namely the Ticket Eater. The Ticket Eater gives you a Voucher, and you can submit the Voucher to the Prize Machine to unlock the stickers. For each Voucher, you have to submit 20 tickets, which you can earn by playing an arcade game. The better you do at these games, the more tickets you collect. I preferred Heftin' With Helpules, because all I had to do was quickly press the E key to pass.