The trick of the game is NOT to use up too much power before 6AM hits. If you use up the power too early, Freddy will kill you if you run out of power. Newer players may frantically and profusely check the cameras, use the hall lights, and close the doors, wasting a LOT of power. You must use your tools as carefully and wisely as you can.
Enemies that can harm you: Freddy Fazbear, Bonnie, Chica, Foxy, and Golden Freddy
