FNAF 1 was pretty simple really. Once you learned how each animatronic ticked, it was pretty easy to fully beat nights 1-6. FNAF 2 is still by far the hardest games of the series and even i've yet to beat night 6. Same routine as the first game. Now when it comes to FNAF 3, from all the videos i've seen so far, its difficulty doesn't come from the sheer number of animatronics, but from the sheer amount of semi-tactics and routing you're gonna have to do.