In classic style you must have all the wrong answers and pass the ending and go to Baldi's office and the second (the last) you must have the teleport and pass the ending blow out the paster's candle and use the teleport and go to the principal's office or the detection and that's it I hope it helps you
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Yes bro is easy but You have to be careful with the scanning robot because it can take away your teleportation, that is, the party style item. There are also items that also take away items like the bean gum, the ice soda, and a bomb that I forgot the name of. So that it doesn't take away your items, you have to throw the soda or gsoda so that it gives you time to escape from the robot.