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Trust your hearing, bonnie and chica make footsteps sounds when you have to close their doors, but they are REALLY quick. Count six laughs from freddy, in the sixth stay in her camera or close the right door, when she leaves there´s no reason to stay in the camera in the right (idk what camera is, b4?). After that, the 7, 9 and so on are safe to not look at her, in the 8, 10 and so on she will be at the door. For foxy try to keep fliping her camera, i´m not sure if the whole game is coded the same as fnaf 1, so I think you need to see her camera in order to stall her. Sometimes you´ll hear two footsteps at the same time, if you do, close both dors and then check the flashlights. They move really fast in 4/20, so it will take a second or two to leave the door or attack  you. If you see foxy run, close the left door and wait until she isn´t knocking. 

good luck man, tell me if you manage to complete 4/20