FNAF 2 removed the doors. Where the first game gave you two doors and a power budget, the sequel gives you a flashlight, air vents on both sides, and a spare Freddy Fazbear head to put on when something walks into your office — because the animatronics will leave if they think you're one of them.
It's more frantic than the original: more animatronics, more places to check, and a music box you have to keep winding remotely or the Puppet comes for you regardless of anything else.
By design — the sequel replaces them with a Freddy mask you wear to fool the animatronics, plus a flashlight for the vents. It makes the game far more frantic than the first.
A wind-up box on camera 11 that keeps the Puppet in its place. If it runs down, the Puppet comes and nothing can stop it — so winding it is the highest priority every night.
No. It fools most of the animatronics but not Foxy, who has to be driven back by flashing the light down the hall.