animatronic characters, Five Nights at Freddy's 2, challenging gameplay, security cameras, limited power supply, flashlight, music box, puppet mechanic, faceless Bonnie, old animatronics, new animatronics, jump scares, office setting, vintage pizzeria, survival horror, strategy required, quick reflexes, monitor ventilation, child's bedroom, eerie atmosphere, dim lighting, 3/4 perspective, tension-building soundtrack, night shift, animatronic movements, unpredictable patterns, multitasking, ventilation system, player vigilance, high difficulty level, complex AI.