The ideal strat is to switch to Cam4B as to stale Freddy so you don't waste power shutting the door everytime. This usage stales Foxy and I only check his progress twice and close both doors to be safe. Also I highly recommend you use R3 to move around so you don't accidentally move off 4B. So, as long as you cycle the lights, cam flips, and occasionally checking on Foxy. You'll beat 4/20 in no time! Leave any questions in the comments if you need any help!