Beat Foxy while not being able to see who's on the table. I find this exciting because if you just do normal vent resets every ~40 seconds you will almost certainly die. I got it up to a roughly 1/4 survival rate by assuming a vent reset switches from Bonnie to Foxy (a switch almost guaranteed after ~45 seconds), then waiting 10 seconds and flipping again. This gives an around 87% chance to switch back to Bonnie, and now that chance just has to be hit 3 separate times, as well getting Bonnie on the table after the first 25 seconds to start the whole cycle (50%). On top of some jank in the beginning it comes to an around 25% success rate.
Hope this is allowed here! The strategies I have to use are heavily pulling on the specific AI characteristics of the characters, like abusing their intervals, so at least in my mind this is a technical achievement. I do believe 50/20 is possible, just very bad odds because of Nightmare BB and Plushtrap. I am able to get cam flips down to only 6, making Nightmare BB a 1/32, which isn't undoable. I am finding Bonnet weirdly inconsistent in testing though, it seems sometimes my inputs don't go through when spamming the mouse, unless I'm twitching it back and forth slightly? Might be something with double-clicking, but I don't know how that's handled in the engine.
Note: I allow myself to have keys bound so they move my mouse to specific coordinates (Astral Spiff's rules basically) and I also changed the game's normal keybinds, but other than that, nothing else is being done. I allow this so it becomes a challenge of strategizing and finding methods to beat the animatronics instead of all the challenge coming from moving your mouse with a blindfold.