Hiding is a game mechanic for the game Five Nights at Treasure Island introduced in the remastered version. As revealed in AnArt's files, it was going to be in the original demo but a memory leak with Gamemaker prevented the source code that included this to be present in the build.
Holding SHIFT allows the player to hide under the desk in The Office until a Suit leaves The Office. A message will appear at the bottom of the player's screen that explains to hold shift to hide. Upon hiding, a message appears onscreen to explain that hiding will have a 50/50 chance of working against a suit.
In Remastered 1.0, Photo-Negative Mickey is the only suit that has its own jumpscare if the player is caught under the desk; however, more suits have been confirmed to have their own hiding jumpscare as well.
In the files of the original demo from before the remastered demo was started, animations of Oswald, Goofy, and The Face were present.