While there are several possible endings, the 'Burntrap' ending to Five Nights at Freddy's: Security Breach is considered canon and is arguably the most compelling. Related: How FNAF: Security Breach's Ending Sets Up A Sequel All FNAF: Security Breach endings are interesting, and each has distinct lore implications, but one ending in particular is especially intriguing. Another potential ending sees Gregory and Freddy burn down the Pizzaplex using flammable plush toys. Other endings see the Pizzaplex closed for health reasons following the destruction of Freddy, or let Gregory escape with Freddy's still-living head.
Choosing to leave the Pizzaplex early through an alley unlocks an ending where protagonist Gregory is stalked and presumably killed, while another ending lets Gregory and Glamrock Freddy escape through the mall's loading dock. There are several different endings to Five Nights at Freddy's: Security Breach, each one being unlocked depending on the player's actions.
